Russia launched four missiles and 136 drones into Ukraine overnight into Monday morning, according to Ukraine's air force, after President Donald Trump said the U.S. would provide Kyiv with more Patriot surface-to-air systems to help defend against Russia's nightly bombardments.

Under the plan, other NATO countries would buy U.S.-made arms, then give them to Ukraine to defend itself against Russia. NATO’s secretary general was set to meet Mr. Trump on Monday.

When President Donald Trump won last year’s election, European officials quickly began discussing how to sustain US weapons shipments to Ukraine under a leader who had vowed to pull back American support.