The US and Germany have pledged to equip Ukraine with some of the advanced weapons it has long desired for shooting down aircraft and knocking out artillery, as Russian forces closed in on capturing a key city in the east.
Germany on Wednesday said it will supply Ukraine with up-to-date anti-aircraft missiles and radar systems, while the US announced it will provide four sophisticated, medium-range rocket systems and ammunition.
The US is trying to help Ukraine fend off the Russians without triggering a wider war in Europe. The Pentagon said it received assurances that Ukraine will not fire the new rockets into Russian territory.
The Kremlin accused the US of pouring fuel on the fire.
Western arms have been critical to Ukraine's success in stymieing Russia's much larger and better-equipped military, thwarting its effort to storm the capital and forcing Moscow to shift its focus to the industrial Donbas region in the east.
But as Russia bombards towns in its inching advance in the east, Ukrainian President Volodymyr Zelenskyy has repeatedly pleaded for more and better weapons and accused the West of moving too slowly.
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Andriy Yermak, the head of the Ukrainian president's office, hailed the new Western weapons.
I'm sure that if we receive all the necessary weapons and strengthen the efficient sanctions regime we will win, he said.
The new arms could help Ukraine set up and hold new lines of defense in the east by hitting back at Russian artillery pieces that have been battering towns and cities and by limiting Russian airstrikes, said retired French Gen Dominique Trinquand, a former head of France's military mission at the United Nations.
"The NATO countries the European nations and the Americans have progressively escalated the means that they are putting at Ukraine's disposal, and this escalation, in my opinion, has had the aim of testing Russian limits, he said. Each time, they measure the Russian reaction, and since there is no reaction, they keep supplying increasingly effective and sophisticated weaponry.
Military analysts say Russia is hoping to overrun the Donbas before any weapons that might turn the tide arrive. It will take at least three weeks to get the precision US weapons and trained troops onto the battlefield, the Pentagon said. But Defence Undersecretary Colin Kahl said he believes they will arrive in time to make a difference in the fight.
The rocket systems are part of a new $700 million package of security assistance for Ukraine from the US that also includes helicopters, Javelin anti-tank weapon systems, radars, tactical vehicles, spare parts and more.
The rockets have a range of about 50 miles (80 km) and are highly mobile. Ukraine had pushed unsuccessfully for rockets with a range of up to 186 miles (300 km).
Kremlin spokesman Dmitry Peskov said Moscow does not trust assurances that Ukraine will not fire on Russian territory. We believe that the US is deliberately and diligently pouring fuel on the fire, he said.
Col Gen Mikhail Mizintzev later went further, directly accusing Ukraine of planning to fire US-provided missiles from the northeastern Sumy region at border areas in Russia. The claim, which he said was based on radio intercepts, couldn't be independently confirmed.
Russian Foreign Minister Sergey Lavrov said Ukraine's push for more weapons is a direct provocation intended to draw the West into the fighting. He warned that the multiple rocket launchers would raise the risk of an expanded conflict.
Sane Western politicians understand those risks well, he said.
As the new weapons shipments were announced, a Russian missile hit rail lines in the western Lviv region, a key conduit for supplies of Western weapons and other supplies, officials said. Regional Gov Maksym Kozytskyy said five people were wounded in Wednesday's strike, and the head of Ukrainian railways said the damage was still being assessed.
Germany's promise of IRIS-T air defence systems would mark the first delivery of long-range air defence weapons to Ukraine since the start of the war. Earlier deliveries of portable, shoulder-fired air defence missiles have bolstered the Ukrainian military's ability to take down helicopters and other low-flying aircraft but didn't give it enough range to challenge Russia's air superiority.
Germany has come under particular criticism, both at home and from allies abroad, that it isn't doing enough. German Chancellor Olaf Scholz told lawmakers that the IRIS-T's surface-to-air missiles are the most modern air defense system the country has.
With this, we will enable Ukraine to defend an entire city from Russian air attacks, he said. The radar systems will also help Ukraine locate enemy artillery.
A regional governor said Russian forces now control 80% of Sievierodonetsk, a city that is key to Moscow's efforts to complete its capture of the Donbas, where Ukrainian forces and Russian-backed separatists have fought for years and where the separatists held swaths of territory even before the invasion.
Luhansk Gov Serhiy Haidai said Russian troops were advancing in the city during fierce street battles with Ukrainian forces, though he noted that in some districts the Ukrainian troops managed to push them back.
The only other city in Luhansk that the Russians have not yet captured, Lysychansk, is still fully under Ukrainian control, he said, but is likely to be the next target. The two cities are separated by a river.
If the Russians manage to take full control over Sievierodonetsk within two to three days, they will start installing artillery and mortars and will shell Lysychansk more intensively, Haidai said.
Zelenskyy, meanwhile, said the country is losing between 60 and 100 soldiers a day in the fighting.
He turned the focus to children in his nightly video address, saying 243 of them have been killed in the war, 446 have been wounded and 139 are missing. The real numbers could be higher, he added, as his government doesn't have a full picture of areas under Russian occupation.
Zelenskyy also said 200,000 children are among the Ukrainians who have been forcefully taken to Russia and dispersed across that vast country: The purpose of this criminal policy is not just to steal people but to make those who are deported forget about Ukraine and unable to return.
In southern Ukraine, a regional governor sounded a more positive note, saying Russian troops were retreating and blowing up bridges behind them.
They are afraid of a counterattack by the Ukrainian army, Vitaliy Kim, governor of the Mykolayiv region, said on the Telegram messaging app.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)