DUBAI, United Arab Emirates—Iran displayed three ballistic missiles at an outdoor prayer esplanade in central Tehran on Friday as talks in Vienna aimed at reviving Tehran’s nuclear deal with world powers flounder. The missiles—known as Dezful, Qiam, and Zolfaghar—have official ranges of up to 1,000 kilometers (620 miles) and are already-known models, the paramilitary Revolutionary Guard said. Diplomats from countries that remain in the 2015 nuclear deal—Britain, France, Germany, Russia, and China—are working with Tehran to revive the accord, which had sought to limit Iran’s nuclear ambitions in exchange for lifting of economic sanctions. American diplomats are present at the nuclear talks in Vienna but they are not in direct talks with Iranians. The accord collapsed in 2018 when then-President Donald Trump unilaterally withdrew the United States from the deal and reimposed sanctions on Iran. A report by Iranian state television said the missiles on display were the same types …