A day after Ukraine launched an unprecedented drone attack on airbases inside Russia, the warring sides sat down for a second round of direct talks in Turkey.

Kyiv’s success during the June 10 attack demonstrates the growing sophistication of the Ukrainian air defense system—but also the increasing pressure the system is facing against the Russian onslaught.

Apart from drones, 20 missiles of various types were fired at different parts of Ukraine, according to the air force, which said the barrage targeted mainly central and western areas of Ukraine.

Russia’s Defense Ministry said on Sunday that Ukrainian drones attacked airfields in five regions and that several aircraft had caught fire.

Russia launched 315 drones at Ukraine overnight into Tuesday, in what Ukrainian President Volodymyr Zelensky said was “one of the largest” attacks on the capital Kyiv, with local officials in the southern port city of Odesa also reporting a maternity ward there had been hit.

Ukraine's surprise drone attack targeting Russian aircraft last week was a "wake-up" call to the emerging threats the technology can pose domestically.