The United States has shown approval toward Japan's plan to have Iranian President Hassan Rouhani visit the country, according to diplomatic sources, as Tehran is seeking to break a deadlock over a nuclear deal with world powers.

Washington has also urged Tokyo to share the outcome of a summit between Prime Minister Shinzo Abe and Rouhani, the sources said. A senior U.S. official has relayed the message to Japan.

Japanese and Iranian officials are arranging for Rouhani to visit around Dec. 20, according to the sources. If realized, it will be the first visit to the country by an Iranian president since Mohammad Khatami in October 2000.