Oil held losses below $60 a barrel as investors weighed the prospects of Iran increasing crude exports in an oversupplied market. Futures were little changed in New York after falling 2.2 percent Monday. U.S. and European diplomats meeting in Vienna said a path to a comprehensive nuclear accord with Iran can be reached within days as Tuesday’s deadline for an agreement is set to be missed. A measure of volatility in crude trading rose the most since December amid concern financial turmoil in Greece will prompt its exit from the euro area. Oil is headed for its first monthly drop since March as the Greek debt crisis prompted investors to avoid risky assets, while signs of a global glut persist. Iran, the fifth-largest producer of the Organization of Petroleum Exporting Countries, has estimated it can double exports from about 1 million barrels a day within six months if international […]