volatile. japan currently down slightly, hong kong a lot worse. the japanese yen, seen as a safe haven, has gained quite significantly in value. here's our us business correspondent michelle fleury in the world of global finance, the decision by western governments to curb the central bank is unheard of for an economy the size of russia's. the us has previously sanctioned the central banks of iran and north korea, both much smaller, less—connected economies. russia's central bank has spent years building up $630 billion in reserves, and a big chunk of that made up of gold, bonds and securities is held overseas. the measures agreed this weekend are designed to stop it from using those reserves to shore up its economy and to cushion the blow from sanctions that have already been imposed. now, the us and its allies haven't yet provided details