The leaders of Japan and Iran met on the sidelines of U.N. meetings in New York on Sunday, with Tokyo proposing increased investment as an impetus for Tehran to implement a nuclear deal with six major powers.

Prime Minister Shinzo Abe and Iranian President Hassan Rouhani also agreed to work together toward an early conclusion of recently commenced talks to sign a mutual investment pact, a Japanese official said.

Abe said it was important for Tehran to put into action the accord on the country's nuclear programs reached in July with the U.N. Security Council permanent members, plus Germany, and to cooperate with the International Atomic Energy Agency.