不顾美俄施压，乌克兰仍未承诺参加和谈！

Group 1 - Ukraine resists pressure from Russia and the US, refusing to commit to peace talks scheduled for June 2, awaiting clarity on Russia's proposals [1] - Both Russia and Ukraine express a desire to demonstrate support for US President Trump's efforts to end the conflict, with Ukraine seeking more military aid and Russia hoping for eased economic sanctions [1] - Turkey is once again acting as a mediator, having previously hosted talks in Istanbul that did not yield breakthroughs, and is optimistic about future discussions [2][3] Group 2 - Russian President Putin's conditions for ending the conflict include a written commitment from Western leaders to halt NATO's eastward expansion, which appears to have US support [2] - Ukrainian Foreign Minister Andrii Sybiha emphasizes the importance of receiving documents in advance for meaningful discussions, expressing interest in a ceasefire regardless of its duration [3] - The Russian delegation to the Istanbul talks will be led by Vladimir Medinsky, who previously headed the Russian team in earlier negotiations [3]