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Russia craft begins mission to return stranded ISS crew

A Russian Soyuz spacecraft has blasted off on a mission to bring back to Earth a crew stranded on the International Space Station by a leak in the cooling system of their original return capsule.

Tass news agency said the unmanned Soyuz MS-23 lifted off on Friday from Baikonur space centre in Kazakhstan and had been placed in orbit. It was due to dock with the ISS on Saturday.

Russian cosmonauts Sergey Prokopyev and Dmitry Petelin and US astronaut Francisco Rubio had been due to end their mission in March. They were left stuck in space after the cooling system of their Soyuz MS-22 capsule started leaking two months ago.

Russian space agency Roscosmos said this week the trio would now return to Earth aboard Soyuz MS-23 in September. The damaged MS-22 spacecraft is now scheduled to land without a crew in March.

Both NASA and Roscosmos believe last year's leak on the MS-22 spacecraft was caused by a micrometeoroid - a tiny particle of space rock - hitting the capsule at high velocity.

A similar impact is also believed to have caused a separate leak this month on the cooling system of the Progress MS-21 cargo ship, taken out of orbit last week.

Tass said 430 kilograms of cargo was sent aboard the replacement craft, including medical equipment, scientific instruments, water, food and cleaning supplies. Tass quoted a Russian space official as saying the amount of food sent was three times the amount normally dispatched for such missions.

The leaks have prompted Roscosmos and NASA to rearrange their schedules and postpone planned space walks.