By Sinead Cruise and Matt Scuffham LONDON/NEW YORK (Reuters) -Russia laid down strict new rules for foreigners seeking permits to buy and sell Russian assets ranging from securities to real estate, a client memo by Citigroup showed, amid an exodus of international firms in response to Western sanctions. Russia temporarily stopped foreigners trading Russian assets this month, saying it wanted to ensure decisions to exit were considered and not driven by political pressure, following Moscow’s invasion of Ukraine. It has now revealed the details of an application process that must be followed bef…