Zelenskyy: 'The ideal solution in peace negotiations is to urgently end the war. At least the first step should be an unconditional complete ceasefire. This is important.A ceasefire is also a complex process. Yes, it's about political will and decisions, but at the same time, there are buffer zones of 20, 30, 40 kilometers today. If there are no guarantors and monitoring of the ceasefire, Russia could take advantage of this and advance 20 kilometers in some parts of Ukraine.'