Trump on Monday said the United States would ship "billions of dollars' worth" of military equipment to NATO members, paid for by the alliance, to be handed over to Ukrainian forces battling grinding Russian advances. Trump had earlier this month suggested NATO would "100 percent" pay for U.S. weapons, which would be sent to Ukraine.

US Ambassador to NATO Matthew Whitaker has said that the Trump administration is trying to deliver US weapons to Ukraine as quickly as possible in line with a plan whereby they will be sold to the Alliance.

Ukrainian President Volodymyr Zelenskiy also held talks with a U.S. envoy on Monday on increasing weapons production and arms purchases.