U.S. Secretary of State John Kerry will meet with his Russian and Iranian counterparts in Switzerland on March 2.
Kerry will hold talks with Russian Foreign Minister Sergei Lavrov on the Ukraine crisis, less than a week after Kerry accused Russian officials of "lying...to my face" about Moscow's support for pro-Russian separatists in eastern Ukraine.
Kerry will also address a high-level meeting of the UN Human Rights Council while in Geneva.
He will then go to the Swiss resort town of Montreux to meet with Iranian Foreign Minister Mohammad Javad Zarif for talks on a deal curbing Iran's controversial nuclear program in exchange for relief for Tehran from economic sanctions.
Iran and the six world powers negotiating with it have until March 31 to agree to a temporary deal.