BRUSSELS — The race is on.

As columns of Russian troops started pouring into Ukraine practically two months in the past, the US and its allies began supplying Kyiv with weapons and tools for what many anticipated to be a brief conflict: sniper rifles, helmets, medical kits, encrypted communications, plenty of bullets and the moveable, shoulder-held Stinger and Javelin missiles that rapidly turned icons of the battle.

Defying the percentages, Ukraine held on to its capital and pushed Russia from the north. Now, because the Kremlin switches gears and begins a concerted effort to seize jap Ukraine, Washington and its allies are pivoting as nicely, scrambling to provide Ukraine with greater and extra superior weapons to defend itself in a grinding conflict.

The West is targeted on sending longer-range weapons like howitzers, antiaircraft techniques, anti-ship missiles, armed drones, armored vehicles, personnel carriers and even tanks — the kind of arms that President Biden stated have been tailor-made to cease “the broader assault we anticipate Russia to launch in jap Ukraine.”

“The regular provide of weapons” has helped “be certain that Putin failed in his preliminary conflict goals to beat and management Ukraine,” Mr. Biden stated final week. “We can not relaxation now.”

Then, after a video name with allies on Tuesday, Mr. Biden instructed reporters that the US would ship extra artillery to Ukraine. He’s anticipated to announce a brand new navy help bundle for Ukraine within the coming days, based on an individual briefed on his plans. The help quantity shall be on par with the $800 million bundle of weapons and artillery that was introduced final week, the individual stated.

However the technique comes with a notable danger: antagonizing Russia a lot that it ignites a wider, worldwide battle.

Russia just lately despatched a proper warning to the US, saying that Western deliveries of the “most delicate” weapons techniques to Ukraine may carry “unpredictable penalties.”

American officers say the warning exhibits that the weapons being despatched are making an enormous distinction on the battlefield. So, for Washington no less than, considerations about supplying arms that Russia would possibly think about “escalatory” have ebbed — as has the preliminary fear that Ukraine will use longer-range weapons, like jet fighters, to assault Moscow itself and set off an even bigger conflict.

Officers in Washington at the moment are grappling with how a lot intelligence to provide the Ukrainians about bases inside Russia, provided that the Ukrainians have already made small helicopter raids on Russian gasoline depots. The White Home has additionally held again on supplying some weapons that might strike Russian forces throughout the border, like rocket artillery, floor assault planes and medium vary drones.

Some argue the People are being too cautious.

“Seven weeks in the past, they have been arguing over whether or not to provide Stinger missiles — how foolish does that appear now?” stated retired Lt. Gen. Frederick B. Hodges, the previous prime U.S. Military commander in Europe. “We have now been deterred out of an exaggerated concern of what presumably may occur.”

Nervousness about upsetting a wider conflict persists amongst some NATO allies, most visibly in Germany, which worries that supplying Marder infantry-fighting autos, thought of one of many world’s finest armored autos, might be perceived by Russia as making Berlin and NATO events to the conflict.

Robert Habeck, an influential minister in Germany’s new authorities, has stated that supplying tanks could be an escalation and needs to be a matter of consensus inside NATO and the European Union. “Heavy weapons are synonymous with tanks, and all NATO international locations have to this point dominated this out to not grow to be targets themselves,” he stated.

However these are sovereign — not alliance — choices, and Washington and quite a few allies are delivery such weapons anyway, concentrating on supplying Soviet-era weapons that the Ukrainians know use, together with Western arms the Ukrainians can take up pretty simply.

Russia is placing Ukraine with abandon, complicating the circulate of those newer weapons from Ukraine’s western borders with Poland, Romania and Slovakia to the battle within the east. That presents one other danger: that Russian assaults may additionally stray throughout the Ukrainian border and hit NATO international locations, “each inch” of which Mr. Biden has vowed to defend militarily.

How this logistical race goes may nicely form the result of the conflict.

Russian forces, having suffered an embarrassing retreat from northern Ukraine and the suburbs of the capital, Kyiv, are repositioning for what the Kremlin and Ukrainian officers name a pivotal offensive to take jap Ukraine.

Not like lots of the earlier battles, this one is anticipated to function extra tank battles on open floor, extra long-range artillery and extra weaponized drones.

The Western effort is each sprawling and costly, with as many as 30 international locations, not all of them members of NATO. The push now could be to get international locations with Soviet-era tanks, artillery and maybe even fighter planes to offer them to Ukraine, with the promise that the US will replenish them with extra trendy, Western-made arms in return. There may be an particularly acute want for Soviet-bloc customary 152-millimeter howitzer shells, since NATO makes use of a unique, 155-millimeter shell.

The USA has additionally agreed to offer some 155-millimeter howitzers, together with 40,000 matching rounds, whereas attempting to purchase Soviet-standard ammunition from international locations that use it, together with nations exterior of Europe, like Afghanistan and even India, a longstanding purchaser of Russian arms.

However that isn’t sufficient, Basic Hodges argued. “We’re nonetheless not considering huge,” he stated. “We’re nonetheless not considering when it comes to Ukraine successful.”

Not like the early a part of the conflict, when many international locations appeared to compete to announce what they have been offering Ukraine, the present race is being run largely in secret.

A lot of the coordination, together with get matériel into Ukraine, is being dealt with by means of the US European Command, or Eucom, based mostly in Stuttgart, Germany, and thru a blandly named Worldwide Donors Coordination Heart arrange with the British.

The command stated that it established a “management heart” to coordinate weapons and humanitarian help “from world wide” for Ukraine in early March. However it declined to debate the small print.

The Pentagon gave a touch, saying that the State Division had licensed transfers to Ukraine of American-provided defensive tools from greater than 14 international locations this yr.

However nations are attempting to not promote to Moscow precisely what’s being offered. France says it has equipped 100 million euros of navy tools to Ukraine, with out specifying what it has despatched. Some international locations don’t have any need to goad the Russian bear.

A transparent instance was the confusion over experiences that Poland had equipped greater than 100 Soviet-era T-72 and T-55 tanks to Ukraine. Poland refuses to substantiate any such cargo.

Not all nations are being coy. The Czech authorities says it has equipped Ukraine with T-72 tanks and BMP-1 armored autos, whereas the Slovak authorities has made an enormous present of supplying a Soviet-era S-300 antiaircraft missile system.

As for Germany, a part of the issue is that its personal provide of working armor is so low that it has little to spare. Past that, studying to function a contemporary British, American or German tank can take as much as six months, whereas Ukrainian fighters would have little issue working acquainted Soviet-era armor.

“We don’t actually have time to get plenty of heavy American armor into Ukraine, and there isn’t time to coach the Ukrainian navy,” stated Robert M. Gates, former U.S. protection secretary. “However there’s plenty of former Soviet navy tools nonetheless within the arsenals of the East European states.”

The USA, he stated, “should be ransacking the arsenals” of former Warsaw Pact international locations for armor and antiaircraft techniques, “with a promise from the U.S. to backfill over time with our tools to our NATO allies.”

That’s precisely what the US is racing to do, Pentagon officers stated, describing their very own efforts to steer the Slovaks to offer the S-300 missile system to Ukraine. On March 9, Secretary of Protection Lloyd J. Austin III started talking with their protection minister, Jaroslav Nad, and has agreed to ship in Patriot batteries to interchange it.

Comparable conversations are happening with different allies which have Soviet-era weapons and ammunition, the officers stated. The People say they’re additionally talking a number of occasions a day with their Ukrainian counterparts about what Ukraine desires and wishes, and what Western international locations assume they’ll finest present.

Ukraine’s president, Volodymyr Zelensky, repeatedly expresses gratitude for the help however desires extra, sooner. He admitted to being fed up with itemizing the identical set of necessities again and again to totally different nationwide interlocutors, telling The Atlantic in Kyiv: “When some leaders ask me what weapons I want, I want a second to calm myself, as a result of I already instructed them the week earlier than. It’s Groundhog Day. I really feel like Invoice Murray.”

There are additionally provide points with Western weapons, just like the older Stinger antiaircraft missile or the Javelin anti-tank missile.

The Pentagon has urged producers to ramp up manufacturing. Up to now, some 7,000 Javelins have been given to Ukraine, a few third of the entire American stock, which can most likely take three or 4 years to interchange, wrote Mark F. Cancian of the Heart for Strategic and Worldwide Research in Washington.

Final week, the Pentagon met with leaders of eight massive navy contractors, like Raytheon Firm and Lockheed Martin Company, to debate overcome any provide issues — each to replenish American weapons shares which have been drawn down to assist Ukraine and to maintain Kyiv within the struggle. The 2 firms collectively make the Javelin, and Raytheon makes the Stinger.

The USA alone has spent or allotted some $2.6 billion price of such matériel for the reason that conflict started on Feb. 24, and the European Union has offered 1.5 billion euros, or $1.6 billion. However there isn’t a prospect of American or NATO troops going to assistance from Ukraine, officers say. The West is offering the weapons and intelligence — and cheerleading from behind.

The identified listing of what has been offered already is lengthy, and there’s little doubt that provides from NATO international locations — and the coaching of Ukrainian forces after Russia seized Crimea in 2014, to not point out Ukraine’s tenacity and flexibility — have shocked the Russians, badly broken their morale and prolonged the conflict.

Within the months main as much as the conflict and afterward, the US and its allies have despatched Ukraine 25,000 antiaircraft weapons and 60,000 anti-tank weapons, together with 10,000 offered by Washington, Gen. Mark A. Milley, chairman of the Joint Chiefs of Workers, instructed Congress final week.

The USA has additionally offered greater than 50 million rounds of ammunition, 7,000 small arms, 75,000 units of physique armor and helmets, and night-vision goggles, encrypted radios, armored vehicles and personnel carriers, largely drawn from pre-positioned U.S. navy stockpiles, a lot of it in Europe, based on the most recent public listing from the Pentagon.

Because the invasion, the Pentagon has cranked up its huge logistical and transportation community. Inside 4 to 6 days after the White Home approves a switch of weapons from American navy stockpiles, the Pentagon has been in a position to load the matériel onto cargo planes and fly it to about half a dozen staging bases in international locations close to Ukraine, mainly Poland and Romania.

From there, American officers say, the weapons and tools are loaded onto lots of of vehicles and shipped into western Ukraine utilizing quite a lot of overland routes. John F. Kirby, the Pentagon spokesman, stated it takes about 24 to 48 hours for the weapons to make their means from the staging areas into the palms of Ukrainian troops.

“Eight to 10 flights a day are coming into the area, not simply from the US, however from different nations as nicely,” Mr. Kirby stated. “That stuff isn’t sitting round.”

Regardless of repeated threats to take action, the Russians have hardly ever tried to cease this circulate of Western matériel into Ukraine. Pentagon officers say the Russians have been busy preventing in different components of the nation and concern Ukraine’s air defenses. “That circulate nonetheless continues,” Mr. Kirby stated.

Britain, which has been extra public about its contributions within the post-Brexit interval, has equipped about $588 million of matériel, together with anti-tank and anti-ship missiles and long-range artillery.

Coaching the Ukrainians on new tools in the course of a conflict is a problem, although. A few dozen Ukrainian troopers have been already coaching in the US, and the Pentagon has taught them to make use of trendy armed drones, just like the 700 or so Switchblade drones that Washington is now offering.

Army officers name the weapon, which is carried in a backpack, the “kamikaze drone,” as a result of it may be flown instantly at a tank or a gaggle of troops and is destroyed when it hits the goal and explodes.

Greater armed drones, like American-made Predators or Reapers, could be tough for Ukrainians to fly and could be simply destroyed by Russian fighter planes. However Pentagon officers stated the small, moveable kamikaze drones may show less expensive and elusive towards Russian armored convoys.

After the White Home introduced the most recent $800 million tranche of weapons for Ukraine final week, Mr. Kirby stated that American troopers would practice Ukrainian forces in neighboring international locations to make use of a number of the newer, extra refined tools Washington is offering, like radar techniques, in addition to the 155-millimeter howitzers and 11 Mi-17 helicopters.

“We’re conscious of the clock, and we all know time shouldn’t be our pal,” he stated.

Reporting was contributed by Jack Ewing from New York, John Ismay and Katie Rogers from Washington and Erika Solomon from Berlin.