American officials say $450 million assistance package, which also includes ammunition, will be announced later Thursday

US president says there was 'no doubt' that Putin would order his troops into Ukraine, and 'we had data to sustain' that assessment

Kyiv says Russian troops have been repelled on the outskirts of strategic city, as 15,000 civilians suffer under 'constant shelling' by Moscow's forces

Massive aid package garners bipartisan support in Senate, includes funds earmarked for defense; US president hosts Swedish and Finnish leaders at White House

Secretary of State Anthony Blinken says move a result of American arms helping Ukraine fend off Russian advance; safety precautions put in place for diplomats returning to capital

US first lady meets Ukrainian counterpart near border with Slovakia, tells her America stands with people of Ukraine; Olena Zelenska thanks her for 'courageous act'

Official stresses that Ukraine alone decided to target and sink flagship of Russia's Black Sea Fleet using its own anti-ship missiles

New York Times says intel provided by America included location of Russia's mobile military HQ, was used against 'many' of the generals killed in the war

At least nine killed in Russian attacks on towns and cities in eastern and southern Ukraine; dozens of strikes pound Mariupol plant where last fighters holed up

The longer Ukraine fends off attack, the more it absorbs Western weaponry and training -- the exact thing Putin hoped to prevent when invading