By Caroline Valetkevitch NEW YORK (Reuters) – Wall Street’s major indexes ended sharply lower on Wednesday, extending their recent rout as Ukraine declared a state of emergency and the U.S. State Department said a Russian invasion of Ukraine remains potentially imminent. The State Department added that Washington has not seen any indication of Russians backing away, while the White House said President Joe Biden has no intention of sending U.S. troops to fight in Ukraine. Earlier, the West unveiled more sanctions against Russia over its move into eastern Ukraine, and Moscow began evacuating it…