The American military’s European Command is drawing up plans to have two Navy warships in the Black Sea at the time of the Winter Olympics in Sochi, Russia, next month, should they be needed to evacuate Americans in the event of a terrorist attack or any other emergency, a Pentagon official said Monday. American transport planes would also be on the call in the region. So far, the Pentagon has not put the plans into effect, although that order could come in a matter of days, the official said. The ships are to be passing through the region as part of a regularly scheduled deployment, and the planes would remain at their bases, probably in Europe, until ordered to help. The planning was first reported by CNN on Monday. The State Department would coordinate any evacuation of Americans. Any plans to use the American ships or planes would be done in coordination with and with permission from Russia, American officials said.