A Russian Lancet drone struck an evacuation bus in Sumy region, killing nine civilians and wounding seven - a family among the victims. Zelensky and other officials called for increased international pressure and sanctions against Russia in response.

Following Istanbul talks, Trump announced he would call both Putin and Zelensky on Monday to discuss a potential May 19 ceasefire. Reports indicate Senator Rubio delivered a "decisive message" from Trump to Lavrov, with Trump threatening "crushing sanctions" should Russia undermine negotiations.

Military intelligence chief Budanov stated a massive "1000 for 1000" prisoner exchange could happen next week, with SSU already beginning preparations. This represents the one concrete outcome from the Istanbul talks, where Russia had previously demanded territorial concessions for such an exchange.

The Kremlin indicated a possible Zelensky-Putin meeting, while Ukrainian forces reported destroying over 1,000 Russian tanks and 2,500 armored vehicles this year.