LONDON—Oil prices fell on Thursday as talks to resurrect a nuclear deal with Iran entered their final stages, but losses were capped by heightened tensions between top energy exporter Russia and the West over Ukraine. Brent crude traded down $1.26, or 1.3 percent, at $93.55 a barrel by 0914 GMT. U.S. West Texas Intermediate (WTI) crude was down $1.34, or 1.4 percent, at $92.32. Both contracts fell more than 2 percent earlier in the session. “(The) oil market is locked in a tug of war between Iranian sanctions relief and Russian-Ukraine tensions,” said Stephen Brennock at brokerage PVM Oil. The United States is in “the midst of the very final stages” of indirect talks with Iran, aimed at salvaging a 2015 deal limiting Tehran’s nuclear activities, State Department spokesperson Ned Price said on Wednesday. A decision on salvaging the nuclear deal was said by France to be only days away …