President Joe Biden said Monday he was concerned that Russian President Vladimir Putin “can’t find a way out” of ending the war in Ukraine after failing to occupy the country.

During a charity event outside Washington DC, Biden said Putin “believed he could break NATO and the European Union” when he ordered the February 24 invasion of Ukraine, but according to the US president, he failed.

Biden, who described Putin as “very calculating”, considered that he is not managing to “find a way out” of the invasion, so the White House is “studying” what to do about it.

Initially, Russian troops tried to take the Ukrainian capital, Kyiv, but in April they withdrew from the area and focused their efforts on the Donbas region in eastern Ukraine.

For his part, Putin defended on Monday that the objective of his military campaign is to defeat “Nazism” in Ukraine and guarantee Russia’s security in the face of the “threat” from NATO, on the occasion of Victory Day over Nazi Germany.

“The defense of the homeland has always been sacred. Now, in our days, you fight for our people in Donbas, for the security of our homeland, Russia,” the Russian president stressed during the traditional military parade in Red Square.

Later, the Pentagon responded to the Russian president that in Ukraine “there are only Ukrainians, no Nazis.”

“We’ve heard the same bluster, the same untruths, the same lies, in terms of their rhetoric, that we’ve heard from the beginning,” US Defense Department spokesman John Kirby told a news conference.