REUTERS — The top three U.S. law schools have joined forces to track law firms’ policies on working for Russian clients in the wake of that country’s invasion of neighboring Ukraine, accusing some of “splitting hairs about which clients they will avoid.” Law professors at Stanford, Yale, and Harvard categorized statements by major U.S. and U.K. law firms regarding their Moscow offices and Russia-related work, calling on them to fully cut ties with the Kremlin, state-owned or controlled firms, and sanctioned entities and people. Law firms shutting down or spinning off their Moscow offices is not enough, the professors say. “When McDonald’s shuts its doors in Moscow, it cannot mail burgers from London,” they wrote on a Stanford website for the effort. “By contrast, law firms can and do serve Russian interests from afar.” So far only three firms are listed on the site as declining all new work from sanctioned parties or government-related clients and withdrawing from current engagements when possible: DLA Piper; Norton Rose Fulbright; and Gowling WLG. Far more firms have either stayed silent on Russia or issued public statements that fall short of promising to eschew work for Kremlin-linked or sanctioned clients completely.