GLOBAL MARKETS-Euro, stocks slide as deadline for Greece nears

* Stocks, euro slip lower before euro zone meetings on Greece * Dollar mostly higher; oil gains * Russian, Ukraine markets sag before Minsk meeting * Wall Street likely to open lower By Marc Jones LONDON, Feb 11 (Reuters) - European stocks and the euro fell on Wednesday and the dollar rose as Greece and the euro zone edged closer to confrontation. Euro zone finance ministers meet in Brussels later on Wednesday and EU leaders on Thursday, but officials are already playing