A Soyuz booster rocket lifted off as scheduled from the Russia-leased Baikonur launch facility in Kazakhstan to put the Soyuz MS-27 carrying the trio in orbit
The talks are expected to focus on the North Atlantic Treaty Organization (NATO) and the rising tensions in Ukraine, as well as arms control, cybersecurity and climate change.
The two presidents agreed to have their teams work urgently to complete a five-year extension of the New START nuclear weapons treaty that expires next month.
