If the plan is finalized, it would allow critical aid to flow to Ukraine as it endures one of Russia’s heaviest assaults of the war.

The arrangement allows Ukraine to get weapons it needs in its war with Russia while providing a way for Europe to increase its defense spending as promised.

WASHINGTON — The United States is selling weapons to its NATO allies in Europe so they can provide them to Ukraine as it struggles to fend off a recent escalation in Russia’s drone and missile attacks, President Donald Trump and his chief diplomat said.