NASA Says Russians Will Fly on U.S. Commercial Vehicles

Hartman: U.S. and Russian Crews to Fly Both Soyuz and U.S. Commercial Vehicles, Space Policy Online

"Hartman's point was that in an emergency, it might not make sense to have all the Russians leave on one spacecraft and the Americans and others on a separate spacecraft because a mixture of experience may be needed to conduct operations. "When you have these rescue vehicles on orbit and you have to leave the station...it doesn't make much sense for three Russians to leave and expect the four Americans onboard to operate the Russian segment [of the ISS] and vice versa, right?" Hartman said."