VIENNA, March 18 (Reuters) - World powers have not seen any impact so far from tension with Russia over the Ukrainian region of Crimea on nuclear talks with Iran, a spokesman for the European Union's foreign policy chief said on Tuesday.
The powers - the United States, Russia, China, France, Britain and Germany - began a new round of talks on Iran's contested nuclear work on Tuesday in Vienna, a day after Washington and the EU imposed sanctions on Russian officials.
"I haven't seen any negative effect," spokesman Michael Mann told reporters. "We continue our work in a unified fashion". (Reporting by Justyna Pawlak and Louis Charbonneau; Editing by Janet Lawrence)