Trump 'open' to 3-way summit

US President Donald Trump is “open” to meeting his Russian and Ukrainian counterparts in Turkey, the White House said, after the two sides failed on Monday to make headway towards an elusive ceasefire.

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Delegations from both sides did, however, agree another large-scale prisoner exchange in their meeting in Istanbul, which in mid-May also hosted their first round of face-to-face talks.

Turkish President Recep Tayyip Erdogan proposed that Russian President Vladimir Putin, Ukrainian President Volodymyr Zelensky and Mr Trump come together for a third round later this month in either Istanbul or Ankara.

Mr Putin has so far refused such a meeting. But Mr Zelensky has said he is willing, underlining that key issues can only be resolved at leaders-level.