U.S. futures higher ahead of data release

* Talks between Greece and its international creditors stumbled, with euro zone finance ministers accusing the country of refusing to compromise ahead of a deadline next week when an International Monetary Fund loan of $1.8 billion comes due. * Investors will continue to keep an eye on data due today for signs of a recovery in the U.S. economy, which came to a crawl in the first quarter, as the Federal Reserve prepares to raise interest rates for the first time in almost a decade. * The U.S. Com