VIENNA (AP) — With differences still unresolved and the deadline for a deal nearing, Iran and the U.S. have a choice to make: Extend nuclear talks for a second time or face the risk of renewed confrontation and armed conflict.

U.S. Secretary of State John Kerry meets Wednesday in Vienna with Iranian Foreign Minister Mohammad Javad Zarif to try and advance the talks and meet the target date of Nov. 24. But with less than six weeks left until Nov. 24, there may be no alternative to prolonging them.