Prime Minister Fumio Kishida will attend a U.N. conference on nuclear nonproliferation to be held in New York in August, the government said Tuesday.

Kishida would be the first Japanese prime minister to attend a review conference of the Treaty on the Non-Proliferation of Nuclear Weapons. He is expected to deliver a speech as early as Aug. 1, when the conference begins, according to a government source.

"Joined by both nuclear powers and nonnuclear states, the NPT is the foundation of the nuclear disarmament and nonproliferation regime," Chief Cabinet Secretary Hirokazu Matsuno said during a news conference in Tokyo.