By Anton Kolodyazhnyy, Steve Holland and Lidia Kelly MOSCOW/WASHINGTON (Reuters) -U.S. President Donald Trump's offer to join proposed Ukraine-Russia peace talks triggered a flurry of diplomacy as powers from Europe to the Middle East sought a possible path out of the deadliest conflict in Europe since World War Two.

Ukrainian President Volodymyr Zelensky said he is prepared to meet Vladimir Putin this week, shortly after US President Donald Trump urged him to “immediately” accept the Russian leader’s offer to hold peace talks in Turkey.