By Andrea Shalal, Thomas Escritt and Tom Balmforth WASHINGTON/BERLIN (Reuters) -U.S. President Donald Trump threatened "severe consequences" if Russia's Vladimir Putin does not agree to peace in Ukraine but also said on Wednesday that a meeting between them could swiftly be followed by a second that would include the leader of Ukraine.

Ukraine has backed the previous U.S. demand for a full and immediate ceasefire, during which time a peace settlement can be reached. Putin has repeatedly dodged ceasefire proposals, suggesting that the "new territorial realities" of Russian occupation of swaths of southern and eastern Ukraine must be recognized as part of any settlement.