US President Donald Trump has said he does not believe Russia's claim that Ukraine attacked one of Russian leader Vladimir Putin's residences.

Russian President Vladimir Putin's defiant New Year's message contrasts sharply with President Donald Trump's diplomatic push as Ukraine-Russia war approaches fourth year.

U.S. President Donald Trump said on Saturday he was frustrated with Russian President Vladimir Putin over the continued war in Ukraine, repeating that he had initially believed that ending the war would be easy.

The U.S. and Russia have been on opposing sides in Venezuela, with Moscow providing military and economic support to Maduro.

Russian President Vladimir Putin lied when he claimed earlier this week that Ukraine tried to kill him in a massive drone attack targeting one of his residences, according to US intelligence.

Russian President Vladimir Putin and Ukrainian President Volodymyr Zelensky offered contrasting speeches to ring in the new year amid a push to end the nearly four-year war between the two

Seven years before US President Donald Trump invaded Venezuela to oust Nicolas Maduro, his former adviser Fiona Hill had said that Russian leader Vladimir Putin was signalling he wanted to make a deal where he would hand Venezuela to the United States in exchange of Trump allowing Russia to occupy Ukraine.

"I'm not thrilled with Putin. He's killing too many people," Trump told reporters on Jan. 3 during a news conference announcing Venezuelan President Nicolas Maduro's capture.