From a Wall Street Journal story by Stephen Kalin and Georgi Kantchev headlined “Four Russian Military Aircraft Downed Near Border With Ukraine”:
DNIPRO, Ukraine—Two Russian fighter jets and two military transport helicopters crashed in southern Russia on Saturday, while Ukrainian forces struck deep into Russian-controlled territory in eastern Ukraine, moves that suggest Kyiv’s military capabilities are growing.
The crashes are the worst losses for Russia’s military aviation since the first week of its full-scale invasion of Ukraine in February 2022, when Moscow mistakenly assumed that Ukrainian air defenses had been destroyed. It has lost more than 70 planes since then.