Japan says N.Korea nuclear test "unacceptable"

TOKYO, May 25 (Reuters) - North Korea's nuclear test would be a clear violation of the U.N. Security Council resolution and an unacceptable move, Japan's top government spokesman said on Monday after Pyongyang said it had tested a nuclear device.

Chief Cabinet Secretary Takeo Kawamura told reporters that Japan was asking for an emergency U.N. Security Council meeting and would seek a new resolution by the council.

Kyodo news agency said Japan was also considering tightening its own sanctions on the reclusive communist state. (Reporting by Yoko Kubota)