Crude-oil futures remained under pressure in Asian trade Tuesday, as investors monitor the progress of the Iranian nuclear talks in Vienna and a worsening Greek debt crisis. On the New York Mercantile Exchange, light, sweet crude futures for delivery in August traded at $57.97 a barrel at 0258 GMT, down $0.36 in the Globex electronic session. August Brent crude on London’s ICE Futures exchange fell $0.29 to $61.72 a barrel. Oil prices had lost around 2% in the previous trading session. Greece looks set to default on its payment to the International Monetary Fund due Tuesday. Markets are also increasingly worried about the likelihood of Greece exiting the eurozone. Meanwhile, Iran has dispatched two senior officials to the nuclear talks in Vienna in a last-minute push for a breakthrough, even as U.S. officials acknowledged the talks are likely to overshoot today’s deadline. There is significant concern […]