John Healey, the British defence secretary, said the NATO ally is "stepping up its support for Ukraine" with a £4.5-billion ($6.1-billion) package of military aid in 2025, and that the U.K. has completed a delivery of 140,000 artillery munitions since the start of the year.

A Ukrainian drone attack last weekend likely damaged around 10% of Russia's strategic bomber fleet and hit some of the aircraft as they were being prepared for strikes on Ukraine, a senior German military official said.