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

Trump agrees to sell billions in US arms to NATO countries including Germany, Finland and Denmark and others for quick distribution to Ukraine, following his ultimatum to Putin on peace talks.

Ivo Daalder, a senior fellow at Harvard Belfer Center, says that President Donald Trump realizes that he needs to change course because the Russian leader has been playing him "for years."

President Trump is hosting NATO Secretary General Mark Rutte at the White House on Monday as the U.S. agrees to sell new and more weapons to Europe and Ukraine.

NATO Secretary General Mark Rutte discusses President Donald Trump's decision to sell weapons to NATO for Ukraine in an interview on 'Special Report.'

President Donald Trump has expressed his support for the collective defense offered by NATO in a reversal of his previous criticism of the alliance. Trump was asked by the BBC whether he still thought the alliance was "obsolete" as he had previously said,

During his campaign, Trump said bringing a quick end to the war was a top priority and that helping Ukraine was a waste of US taxpayer money.

President Donald Trump is anticipated to meet with NATO chief Mark Rutte, make a "major" announcement on Russia, and join an AI and energy summit during his 26th week in office.