Washington, Safar 5, 1434, Dec 18, 2012, SPA - The United States believes that it is up to Iran to come back to the table to solve the international standoff over its nuclear program, the State Department said Monday. "The P-5 plus one remain united in our effort to seek a diplomatic solution," State Department spokeswoman Victoria Nuland told reporters. --SPA 11:38 LOCAL TIME 08:38 GMT www.spa.gov.sa/1060228