Hours before Vance and Zelenskyy were set to meet, a Russian drone with a high-explosive warhead hit the protective confinement shell of the Chernobyl Nuclear Power Plant in the Kyiv region, the Ukrainian president said. Radiation levels have not increased, Zelenskyy and the U.N. atomic agency said.

The future of Ukraine will be the top item on the agenda following a phone call between President Trump and Russian leader Vladimir Putin this week, when they pledged to work together to end the three-year-old Russia-Ukraine conflict.