Top diplomats from France, Germany, the United Kingdom and the United States have postponed a high-level meeting with Ukrainian diplomats in London, after U.S. Secretary of State Marco Rubio said he would skip the talks. The diplomats were set to discuss the framework of a U.S.-proposed ceasefire deal to end Russia’s war on Ukraine. The meeting’s abrupt cancellation came as a Russian drone struck a bus in the city of Marhanets, killing nine people and injuring 42 others. On Tuesday, Ukrainian President Volodymyr Zelensky ruled out any ceasefire deal that recognizes Russia’s annexation of Crimea, the Black Sea peninsula Russia invaded in 2014.

President Volodymyr Zelensky: “Ukraine does not legally recognize the occupation of Crimea. There is nothing to talk about. This is beyond our Constitution. It’s our territory, the territory of the people of Ukraine. … As soon as we start talking about Crimea, about our sovereign territories, we enter a format that Russia wants, which is to drag out the war.”

Meanwhile, The Washington Post reports the Trump administration is working to eliminate programs aimed at holding Russia and its leaders and allies accountable for alleged war crimes, including intelligence gathering on Russian atrocities committed in Ukraine.