Sharjah24 - AFP: Moscow said Tuesday it was leaving the International Space Station "after 2024" amid tensions with the West, in a move analysts warned could lead to a halt of Russian-crewed flights.

The confirmation of the long-mooted move comes as ties unravel between the Kremlin and the West over Moscow's military intervention in Ukraine and several rounds of devastating sanctions against Russia, including its space sector.

Space experts said Russia's departure from the International Space Station would seriously affect the country's space sector and deal a significant blow to its programme of crewed flights, a major source of Russian pride.

"Of course, we will fulfil all our obligations to our partners, but the decision to leave this station after 2024 has been made," Yury Borisov, the new head of Russian space agency Roscosmos, told President Vladimir Putin, according to a Kremlin account of their meeting.

"I think that by this time we will start putting together a Russian orbital station," Borisov added, calling it the domestic space programme's main "priority".

"Good," Putin replied.

The ISS is due to be retired after 2024, although US space agency NASA says it can remain operational until at least 2030.

The ISS was launched in 1998 at a time of hope for US-Russia cooperation following their Space Race competition during the Cold War.

The United States said it was taken by surprise by the announcement.

"It's an unfortunate development given the critical scientific work performed at the ISS, the valuable professional collaboration our space agencies have had over the years," State Department spokesman Ned Price said.

In a statement to AFP, NASA administrator Bill Nelson said the agency "has not been made aware of decisions from any of the partners, though we are continuing to build future capabilities to assure our major presence in low-Earth orbit".

Until now, space exploration has been one of the few areas where cooperation between Russia and the United States and its allies had not been wrecked by tensions over Ukraine and elsewhere.