President Donald Trump and NATO Secretary General Mark Rutte announced what Rutte called a "really big" deal Monday for the US to send Ukraine weapons through NATO, replenishing the besieged country’s supplies of weapons.

As Trump promises more weapons and threatens economic pressure on Moscow, WSJ’s Ukraine Bureau Chief James Marson explains what is at stake for Kyiv in the face of increasing Russian attacks.

During a meeting at the White House, President Trump announced a deal for the United States to send weapons to NATO that would be paid for by the European nations.