US talks with Ukraine and Russia have been delayed since the war with Iran began in February. MIAMI: Ukraine's top negotiator Rustem Umerov will on Thursday (May 7) meet his US counterparts in Florida in a bid to revive mostly frozen talks on ending Russia's invasion, Kyiv and Washington said. US-mediated talks on ending Europe's worst conflict since World War II have shown little progress since February, when Washington shifted focus to its war against Iran. "The Secretary of the National