July 12 (Reuters) - The United States will not impose a deadline on a seventh round of talks with Iran to revive the 2015 nuclear deal, but only Tehran can determine when talks will resume, U.S. State Department spokesman Ned Price said on Monday. "We"re not imposing a deadline on these talks, but ... we are conscious that as time proceeds Iran"s nuclear advances will have a bearing on our view of ultimately returning to the JCPOA," Price said.