The US has approved nearly $2.7bn (£2.3bn) in new aid for Ukraine and allies, including $675m in weapons for Ukraine as it battles Russia.
Defence Secretary Lloyd Austin announced the arms package at a meeting with dozens of fellow ministers at the US air base in Ramstein, Germany.
The aid includes howitzers, munitions, Humvee vehicles, armoured ambulances and anti-tank systems.
The US has already pledged about $13bn in military aid for Ukraine.
The Biden administration said on Thursday it had earmarked $2bn in long-term assistance in the form of investments to bolster the security of Ukraine and 18 of its neighbours, including both Nato members and non-members at risk of future Russian aggression.
It said it would notify Congress of the aid plan.
US Secretary of State Anthony Blinken arrived in the Ukrainian capital Kyiv, as his colleague urged Ukraine’s allies to commit to supporting the country for as long as necessary and be prepared to adapt the type of support offered.
In Kyiv, Mr Blinken said that the aid would be delivered at a “pivotal” moment during the war, with Ukrainian operations against Russian forces “proving effective”.
He also vowed that the US and its allies would “continue to exert that pressure until the aggression ceases and Ukraine is fully sovereign and independent”.
In Washington, US President Joe Biden held a call with a number of US allies – including UK Prime Minister Liz Truss and German Chancellor Olaf Scholz – in which they reiterated their collective support for Ukraine.
On Wednesday, Ukrainian President Volodymyr Zelensky said his country’s military had recently carried out successful attacks against Russian forces which control large areas of Ukraine in the south and the east – and retaken settlements near the north-eastern city of Kharkiv. While in Kyiv, Mr Blinken received a briefing from Ukrainian officials on the counter-offensive.
He did not give details but both Ukrainian and pro-Russian officials report fighting around Balakleya, 60km (38 miles) south-east of Kharkiv.
UK Defence Secretary Ben Wallace says there are signs Ukraine is making real military progress. Western-supplied long-range artillery and rockets are helping to target Russian supply lines and command centres.
Russian President Vladimir Putin denied reverses on Wednesday, saying: “We have not lost anything and will not lose anything.”
Russia says it is fighting neo-Nazis in Ukraine – a claim widely dismissed – and that it is threatened by the Nato alliance’s strong relations with Ukraine.
Russia, a global energy supplier, is locked in an economic struggle with the West which imposed sweeping sanctions in response to the invasion.
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