乌克兰外交消息人士：俄罗斯要求在没有美国和土耳其代表的情况下与乌克兰举行会谈，这表明俄罗斯正在通过提出要求和条件来破坏和平努力。

Core Points - Russia is demanding talks with Ukraine without the representation of the United States and Turkey, indicating an attempt to undermine peace efforts through specific conditions [1]