Oil dropped to trade near $90 a barrel, taking a breather from a rally that’s propelled crude to its highest since 2014. Futures in New York fell as much as 1.7 per cent on Monday after seven weekly gains in which oil’s gained 22 per cent. Diplomats are set to return to Vienna on Tuesday to resume Iran nuclear negotiations, which are viewed as a path to restore the nation’s sanctioned oil to global markets. On Friday, the US signed several waivers related to Iran’s civilian nuclear activities to ease diplomatic efforts. The potential for eventual Iranian barrels as well as crude being overbought from last week’s rally is prompting the market to take a “pause to refresh”