US President Joe Biden on Thursday visited NATO's newest member, Finland.

Speaking alongside Finnish President Sauli Niinisto, he said that Russian President Vladimir Putin has "already lost the war" in Ukraine, with Moscow running short of resources and in economic trouble.

"Putin's already lost the war," Biden told a news conference in Helsinki. "There is no possibility of him winning the war in Ukraine."

He added that Ukraine "will join NATO" and Putin will eventually decide it is not in the interest of Russia to continue the war. "No one can join NATO while a war is going on," Biden said.