GLOBAL MARKETS-Bank results impede Wall St; oil falls as Russia mulls more production

World stocks reversed earlier gains on Monday as underwhelming quarterly results from U.S. banks weighed on Wall Street, while oil prices fell as Russia mulled boosting production. The U.S. benchmark S&P 500 stock index dipped after Goldman Sachs Group and Citigroup Inc both reported quarterly revenue below consensus estimates, though the index pared losses in afternoon trading. MSCI’s gauge of global equities, which has risen more than 14% this year, dipped 0.03% on Wall Street’s negative turn.