NASA and Russia disagree about whether "continued operations are safe", he added, but the remedy for now is to keep the hatch closed between the U.S. and Russian side as investigations continue.

The Russian flights had been costing the U.S. tens of millions of dollars per seat, for years. NASA has also used Russian spacecraft for cargo, along with U.S. contractor Northrup Grumman.

The Russian flights had been costing the U.S. tens of millions of dollars per seat, for years. NASA has also used Russian spacecraft for cargo, along with U.S. contractor Northrup Grumman.

The Russian flights had been costing the U.S. tens of millions of dollars per seat, for years. NASA has also used Russian spacecraft for cargo, along with U.S. contractor Northrup Grumman.

The Russian flights had been costing the U.S. tens of millions of dollars per seat, for years. NASA has also used Russian spacecraft for cargo, along with U.S. contractor Northrup Grumman.

NASA's other option: Russia Russia’s Soyuz capsules are the only other means of getting crews to the space station right now. The Soyuz capsules hold three people at a time.