Russian news agency TASS reported while quoting Foreign Ministry spokeswoman Maria Zakharova saying Russia has put the U.S. on its list of unfriendly states.The move comes amid an escalating diplomatic row between Russia and several European countries.Russian President Vladimir Putin on Friday signed a law to limit the number of local staff working at foreign diplomatic missions and other agencies and ordered the government to draw up a list of unfriendly states that will be subject to the restrictions.Zakharova says the whole story began with another wave of unfriendly U.S. steps and naturally, the U.S. is on this list.