Russian President Vladimir Putin congratulated U.S. President-elect Donald Trump on taking office hours before Trump's inauguration in Washington and said he was open to dialogue with the new U.S. administration on Ukraine and nuclear arms.

Russian President Vladimir Putin said his country was open to dialogue with the new Trump administration on the conflict in Ukraine, as he welcomed what he said was the president-elect's attitude toward preventing a third world war.

Donald Trump plans to have a conversation with Russian leader Vladimir Putin in the first days after his inauguration as President of the United States, CNN reported. Preparations for the conversation and potential meeting have been underway for several weeks.

(Reuters) -Ukrainian President Volodymyr Zelenskiy on Monday congratulated U.S. President Donald Trump on his inauguration and hailed the opportunity to achieve a just peace in his country which has been battling a Russian invasion for almost three years.