Russian aviation authorities have handed over materials on the downed Malaysia Airlines Flight MH17 to the international investigation commission.

"The group of Russian experts participating in the commission has earlier handed over requested data required for a comprehensive and unbiased probe," Russia's Federal Air Transport Agency said on Friday.

The materials include flight data received from the Rostov regional air traffic control center, according to the agency.

The Russian experts also discussed with the chairman of the commission the current situation and future plans of investigation.

The Boeing 777 went down on July 17 in Ukraine near the Russian border, killing all 298 people on board.

Ukrainian authorities said Monday that the international investigation commission pointed to "massive explosive decompression" as a possible cause of the disaster after an examination of the content of the black boxes.

Explosive decompression means the aircraft fuselage suddenly breaks apart, leaving little chance for passengers to survive.