Meanwhile, a Russian attack on the northeastern city of Kharkiv using powerful plane-launched glide bombs killed six people, including a 14-year-old girl on a playground.
The crash was the first reported loss of an F-16 in Ukraine, where they arrived at the end of last month. At least six of the warplanes are believed to have been delivered.
Russian President Vladimir Putin has refrained from committing the forces necessary to push Ukrainian troops out of Kursk, but his military is advancing in Ukraine's east.
The billionaire's arrest prompted a warning from Moscow that he should be accorded his rights. X owner Elon Musk said free speech in Europe was under attack.
The U.S. said it was tightening export controls on 123 entities, including 42 in China, to further restrict Russia’s access to U.S. technology and goods for use in its war on Ukraine.