Olha Semoshkina (top right), chief choreographer of the Veterans' Theatre group, talks to the actors before the premiere of an 18th‑century Ukrainian parody of Virgil's "Aeneid", amid Russia's attack on Ukraine, in Kyiv, Ukraine, December 4, 2025.

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.

KYIV, Jan 20 (Reuters) - Ukraine will establish a system allowing its allies to train their artificial intelligence models on Kyiv's valuable combat data collected throughout the nearly four-year war with Russia, newly appointed Defence Minister Mykhailo Fedorov has said.

Air defenses have been among the most important weapons in this war.