The Norwegian authorities have seized a Russian research vessel in Svalbard at the request of Ukraine’s state-owned energy company, Naftogaz, amid growing tensions between Moscow and NATO states over access to and control of the Arctic.

The Professor Molchanov was detained on Wednesday while docked in Barentsburg, a Russian settlement on the Norwegian-administered archipelago. The Governor of Svalbard said the move followed an August 31 order by the Nord-Troms and Senja District Court granting Naftogaz the right to seize the ship. The vessel has been barred from leaving Barentsburg until further notice.

The crew and passengers aboard the vessel learned about the seizure from media reports, a TASS correspondent traveling with the expedition said. Russian Far East and Arctic Development Minister Aleksey Chekunkov said on Thursday that the crew is safe, adding that lawyers for the Arktikugol trust would soon issue a legal response and intended to challenge the seizure order.

The Professor Molchanov is a Russian state-owned research vessel operated by the country’s hydrometeorological service, Roshydromet. Alongside scientific expeditions, it has served since last year as a regular passenger and cargo link between Murmansk and Barentsburg, transporting scientists, employees of the state-owned Arktikugol, contractors, their families, and supplies to the Russian settlements on Svalbard.