Russia will deny NASA access to the International Space Station (ISS) after 2020. Since the end of the Space Shuttle project, the Russian Soyuz spacecraft has been the only way U.S. astronauts can get to the space station. The Russians can use the Space Station without the U.S. but we cannot.
The ISS crews include Americans and Russians, with visitors from other countries. India has been a partner the last three years in the ISS and sent an astronaut to the ISS in 2012. Perhaps India’s role in the ISS will increase.