President Trump and Ukraine’s leader, Volodymyr Zelensky, are expected to talk about sticking points in negotiations to end the war with Russia.

Ukraine President Volodymyr Zelensky on Tuesday canceled his planned appearance at the World Economic Forum in Davos, Switzerland, and stayed in Kyiv as Russian strikes crippled the country’s energy grid — leaving tens of thousands without heat in the dead of winter.

President Zelensky has called Ukraine's air defence supplies "insufficient", having revealed several systems were "without missiles" until Friday morning. "I can say this openly because today I have those missiles," the president said, adding that Ukraine had received a "substantial package" earlier in the day.