Kisida was in India on Monday and was supposed to go to Tokyo, but instead he went to Poland and from there on to Ukraine by train.
He will pay “respect to the courage and resilience of the Ukrainian people” and affirm the “solidarity and firm support for Ukraine” of Japan and the G7, currently chaired by Japan, the ministry said.
Kisida is expected to return to Poland for the summit talks on Wednesday and return to Tokyo on Thursday.
Kisida’s trip to Ukraine comes at a time when Chinese President Xi Jinping is in Moscow for talks with Russian President Vladimir Putin. The war in Ukraine is one of the main issues of their talks.
The Prime Minister of Japan has developed intensive diplomatic activities in recent days. In Tokyo, he received South Korean President Yun Suk-yeol and German Chancellor Olaf Scholz, but then went to Delhi, where he met with Indian Prime Minister Narendra Modi.