U.S. Secretary of State Mike Pompeo is in Austria, where he will see the head of the United Nations’ nuclear watchdog as members of the U.N. Security Council vote on a long-shot American bid to extend an arms embargo on Iran. The vote in New York will likely set the stage for a showdown between world powers over whether international sanctions eased under the 2015 Iran nuclear deal can or should be reimposed on Washington’s demand. Pompeo’s meeting with International Atomic Energy Agency Director General Rafael Grossi on Friday in Vienna is expected to be finished well before results from the Security Council vote are known.