Expectations were low for any breakthrough on ending the three-year-old war after a string of stunning attacks over the weekend.

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.

Russian state media says the latest round of direct peace talks with Ukraine in Istanbul have ended.

Ukraine has carried out large-scale drone strikes against several air bases deep inside Russia, destroying multiple combat planes, according to the Ukrainian Security Service (SBU).