A Russian airline has launched a bid to operate direct flights between Moscow and Pyongyang, official documents show, a move that could revive the long-dormant route amid growing military and economic ties with North Korea.

Moscow-based Nordwind Airlines submitted a request to Russia’s Federal Air Transport Agency to operate flights between the capitals twice a week, according to materials published by the agency on Monday.

A government commission tasked with issuing flight clearances is set to review the proposal.