President Vladimir Putin has ordered the FSB security service to investigate the incidents immediately, and Russian authorities are reported to have ordered increased security at the country's airports.
Officials said one of the planes, a Tu-134 carrying 34 passengers and eight crew members, crashed in the Tula region, about 180 kilometers south of Moscow. Russian news agencies cited witnesses as saying they saw an explosion on board before the plane crashed. This has not been confirmed.
The second aircraft, a Tu-154 carrying 44 people, was reported missing near Rostov-na-Donu in southern Russia. This plane was reported traveling to the Black Sea resort of Sochi.