In an operation said to be 18 months in the planning, Ukraine conducted a devastating series of drone strikes against Russia air bases on Sunday.

It also roughly tallies with attempts by Russian independent media, such as Meduza and Mediazona, to count the bodies. By this time last year, Meduza reckoned that between 106,000-140,000 Russian soldiers had died. Much of their analysis was based on inheritance records and obituaries on social media and in other outlets.

During the negotiations in Istanbul, Russia handed over its memorandum on ending the war to Ukraine. The document consists of two parts, states the head of the Russian delegation, aide to the Russian President,

Though the knock-on effects are unclear, some military commentators have called the strike Russia's "Pearl Harbor." Hopes for direct peace talks, which resume Monday, remain low.

Vladimir Putin has remained silent for over a day following a series of incidents in Russia. First, in the Bryansk and Kursk regions, railway bridges were blown up. Then, Russian strategic air force bases were subjected to an unprecedented strike by the Armed Forces of Ukraine.

Ukraine on Sunday committed a massive, "Pearl Harbor"-like drone strike on Russia so devastating that experts are expecting a furious reaction from Russian President Vladimir Putin. "We can expect a great deal of sound and fury from Moscow,

Sergei Chudinov, the second secretary of the Russian Foreign Ministry's Department of Linguistic Support and interpreter for Russian leader Vladimir Putin, was part of the Russian delegation at the negotiations in Istanbul,

Ukraine unleashed more than a hundred drones smuggled deep into Russia in what it called its most damaging attack yet.

Dozens of Russian military aircraft have been destroyed in an unprecedented drone attack deep inside Russia, a Ukrainian official has said, the day before critical peace talks between Moscow and Kyiv resume in Istanbul.