The world powers are seeking to seal a historic nuclear deal to end a 13-year standoff. Photo: U.S. Department of State.

Foreign ministers from major powers began crunch talks in Vienna on Monday seeking to seal a historic nuclear deal to end a 13-year standoff, one day before a final deadline, officials said.

The United States, Russia, China, Britain, France and Germany want Iran to sharply curb its nuclear program to make any push to acquire the atomic bomb all but impossible, in return for sanctions relief.

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