Joe Biden accused Donald Trump of “modern upbringing” in his attitude towards Russia and expressed concern that Europe “lossesses the certainty of the United States” in its first interview since leaving the White House in January.

“He (Vladimir Putin) believes that (Russia) has historical rights over Ukraine,” Biden told the BBC. He said anyone who thinks the Russian president will stop if Kiev admits that Trump's recently proposed territory is "just stupid."

Biden's speech as an ally in Delaware was the 80th anniversary of the end of World War II, and Biden said Trump's position was "modern support" referring to British Prime Minister Neville Chamberlain's attempt to appease Adolf Hitler in the 1930s.

He also said he was worried that Europe would lose confidence in “the certainty of the United States and the U.S. leadership” and that the decomposition of U.S.-European relations under Trump “will change the modern history of the world.”

Biden said the leaders of European countries will be left behind: "Want to know, what should I do now? ... Can I rely on the United States? Will they be there?

"I'm worried that our allies will start to wonder if we will remain where we have been treated for the past 80 years," he said.

Biden told Nick Robinson that he found extraordinary meetings in the Oval Office of Trump and Ukrainian President Volodymyr Zelenskyy “under America.”

He continued to condemn Trump's call for the United States to retrieve the Panama Canal, making Canada the 51st state in the United States and occupy Greenland.

"What the hell is going on here? What president is talking about? That's not who we are." "We're about freedom, democracy, opportunity, not about confiscation."

Critics say he challenged his actions against Ukraine too slowly to provide weapons to Kiev’s weapons needed for defense and raise restrictions on their use - he said: “We gave them everything they need for independence and if Putin moves again we are ready to respond more actively.”

Asked about his decision to leave the U.S. presidential election a few months before the election, leaving his successor Kamala Harris with little preparation time, Biden said: "I don't think it's important. We left when we have a good candidate.

"Things are going so fast that it's hard to get away. It's a tough decision," he said. "I think it's the right decision. I think … it's just a tough decision."