text:  Kremlin denies any involvement in Navalny's death. Charles Mainz, NPR News, Moscow. Two astronauts who journeyed to the International Space Station aboard Boeing's problem-plagued Starliner capsule were supposed to have returned to Earth weeks ago. However, the pair say they're confident they can safely come home. Leaks and thruster failures almost derailed their arrival at the space station. The two astronauts say they expect to return once testing there is complete, and they said they're not complaining about getting some extra time in orbit.