Japanese Prime Minister Fumio Kishida attended an emergency meeting of G7 advanced economies and NATO member nations held on Wednesday after news of a missile dropped in Poland, Japan's foreign ministry said.
Kishida told the meeting, held in Bali on the sidelines of a G20 summit, that Japan was "very concerned" and watching developments closely, the ministry said in a statement.
"Developments in Ukraine affect the core of international order and are inseparable from security affairs in the Indo-Pacific region," Kishida said.
"At a time like now, we would like to strengthen co-ordination and co-operation with G7 and NATO allies," Kishida was quoted as saying at the meeting.
(Reporting by Leika Kihara)