Iran is pushing for the United Nations’ arms embargo on the country to be completely lifted, as part of a final agreement to curb its nuclear program, a senior Iranian diplomat said on Monday.

Tehran’s demand is among the final issues still being negotiated between Iran and six world powers—Britain, China, France, Germany, Russia and the U.S.—in an effort to reach a final agreement in the Austrian capital.

The Obama administration has cited Tuesday as the deadline for concluding the talks. But U.S. and Iranian officials have suggested privately in recent days that the negotiations could extend to later in the week. […]