The U.S. and Russia must preserve unity in the negotiations with Iran on its nuclear program, despite differences over Ukraine, says former Deputy Secretary of state, head of the Carnegie endowment, William burns.

"We approached the opportunity to weaken the regime of sanctions (against Iran), but still leave it to continue negotiations and to preserve the International coalition, despite the current difficulties on the issue of the Ukrainian fall and other issues to preserve international approach in the negotiations," burns said at an international conference on oil in Houston.

He said that as a result of common action of the six managed to achieve the conclusion with Iran prior agreements, which must result in July to the final contracts.

"Six" of international mediators and Iran on 2 April agreed that two-thirds of Iran's capacity for uranium enrichment will be stopped for some time in the past ten years. In addition, Iran has assumed objazatelstva place its program to enrich uranium under international supervision for a period of 25 years. The Iranian side nourishes the hope that all the punishment, including unilateral, over time, will be cancelled.

Another round of talks between the " six " international mediators and Iran on the level of political Directors will take place in Vienna on April 24, after 2 days of expert meetings.

sections: Politics