The Russian aviation authorities have responded today to the EU ban on flights of Russian aircraft throughout their territory with a mirror measure. Now airlines from 36 countries* need a permit from the Federal Air Transport Agency or the Russian Ministry of Foreign Affairs to cross Russia.
*
This restriction was introduced in response to the closure of airspace to Russian aircraft after operations began in Ukraine on February 24.
Official source https://favt.gov.ru/novosti-novosti/?id=8963
We hope that the conflict will be resolved soon!