U.S. stocks finished mixed on Monday, as investors worried over uncertainty surrounding Greek debt talks. In world markets, European stocks ended higher, led by the British FTSE 100 rising 0.9 percent. Markets in Hong Kong and China were closed for the Chinese New Year, while Japan's Nikkei ended flat. Greek debt talks were said to be progressing, but officials have yet to announce a deal to ease the nation's overwhelming debt load. Meanwhile, the U.S. Federal Reserve will start a two-day meeting on Tuesday, and for the first time ever, the central bank will release forward-looking forecasts for the federal funds rate. The government will also release its first estimate of fourth-quarter economic growth on Friday. In U.S. company news, BlackBerry maker Research in Motion announced that chief executive officers Jim Balsillie and Mike Lazaridis will hand over the top job to former chief operating officer Thorsten Heins. The stock closed down 8 percent. Oilfield services giant Halliburton released quarterly results that beat Wall Street estimates on both earnings and revenue, but its shares close 2 percent lower. The U.S. dollar fell against the euro and fell against the yen. Light sweet crude oil for March delivery rose $1.25 to $99.58 a barrel on the New York Mercantile Exchange. Gold futures rose $14.30 to $1,678.30 an ounce. The Dow Jones industrial average fell 11.66, or 0.1 percent, to 12,708.82. The broader Standard & Poor's 500 index rose 0.62, or 0.1 percent, to 1,316.00. The technology-heavy Nasdaq composite index fell 2.53, or 0.1 percent, to 2,784.17.