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

Russian and Ukrainian officials will meet in Istanbul to exchange their plans for how to end the three-year war, Europe’s largest conflict since World War

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.

Russian Foreign Minister Sergei Lavrov and U.S. Secretary of State Marco Rubio discussed on Sunday prospects for settling the conflict in Ukraine and Russia-Ukraine talks set for Monday in Turkey, Lavrov's ministry said.

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.

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).

Kyiv also suffered a damaging blow when a Russian missile struck a Ukrainian military training base, killing at least 12 soldiers. Hours before that strike, Russia launched what Ukrainian officials said was the largest combined overnight aerial assault on the country since the start of the war.

Two bridges collapsed in different Russian regions bordering Ukraine, derailing trains and killing at least seven people and injuring dozens, Russian authorities said early on Sunday, while a Russian politician called Kyiv a "terrorist enclave".