Russian cosmonaut Oleg Kononenko is expected to break the world record for the longest time spent in space on 5 June. He will have spent 878 days in orbit by then, surpassing the record set by Gennady Padalka in 2015. By the end of his current expedition, scheduled to end on 23 September, Kononenko will have logged 1,110 days in space. Kononenko, on his fifth space mission, began his training at the age of 34. The ISS, where he is based, remains a key area of international cooperation between Russia and the US despite political tensions.