Astronauts aboard the International Space Station were ​ordered by Nasa to shelter in their spacecraft and prepare for ​potential evacuation on Friday as a Russian ⁠crew attempts to fix ‌a ‌worsening ​leak of air on its portion of the ⁠orbital ​laboratory, Nasa said.The ​four astronauts of Nasa’s ‌Crew-12 mission on ​the station - two US astronauts, ⁠a French ⁠astronaut ​and Russian cosmonaut - got orders from Nasa mission control to enter their Crew Dragon ‌spacecraft docked to ⁠the station and don their spacesuits in case ‌the air leak warrants an emergency evacuation, ​a Nasa official ​said. - Reuters