Russian negotiators at peace talks in Istanbul demanded Ukraine pull its troops out of all the Ukrainian regions claimed by Moscow before they would agree to a ceasefire, a senior Ukrainian official familiar with the talks told Reuters.

* International recognition that five parts of Ukraine -- the Crimea peninsula annexed in 2014, as well as the Donetsk, Luhansk, Kherson and Zaporizhzhia regions -- are Russian. The U.S. draft had proposed only U.S. de jure recognition for Crimea, and U.S. de facto recognition for Russian-controlled parts of the other regions.

After dangling the possibility of his attendance, Trump said he would stay away but still wants to meet with Putin, further weakening the Istanbul talks.