GLOBAL MARKETS-Dollar, shares subdued as Fed keeps markets on edge

* European shares open down 0.3 percent, Nikkei ends down 0.2 pct * Dollar rises vs yen, choppy against basket of key currencies * Oil inches up, gold falls By Marc Jones LONDON, June 18 (Reuters) - Global markets mostly stuck to tight ranges on Tuesday, with uncertainty about the future of the U.S. monetary stimulus programme keeping investors on edge as the Federal Reserve prepared to meet. The U.S. central bank kicks off a two-day meeting later in the day and markets are