Ukraine security service sources tell BBC bombers "are burning en masse" - as Russia confirms Kyiv's drone attack.

A truck pulled in, and drones flew out of it.” From an airbase near Murmansk, in Russia’s far north, came similar stories: “The driver’s running around...drones are flying from his truck toward the base.

Ukraine has carried out large-scale drone strikes against four airbases deep inside Russia, destroying multiple combat planes, according to a source in the Ukrainian Security Service (SBU).

With 41 military aircraft impacted, the Ukrainian drone attack was described by some commentators as Russia's "Pearl Harbor." The attack on Pearl Harbor in December 1941 was a surprise air raid by Japan on the U.S. during World War II. Kyiv's assault follows ground advances by Moscow troops in recent days in Ukraine's Sumy border region.

By making harsh, uncompromising demands in peace talks with Ukraine while continuing to pummel it with waves of missiles and drones, Russian President Vladimir Putin is sending a clear message: He will only accept a settlement on his terms and will keep fighting until they’re met.

Hundreds of towns are under evacuation orders in Ukraine’s northeastern Sumy region where Russian forces are focusing their attacks, as Kyiv officials warn it could be preparing a new offensive.Mandatory evacuation orders were issued for 11 settlements on Saturday,