For Mr. Kishida, the leader of a dovish wing of the governing Liberal Democratic Party, such assertive national security language is a departure from his previous focus on taming the pandemic and reforming economic policy. "It's very astonishing to see the developments in Ukraine," said Ken Jimbo, a professor of international relations at Keio University in Tokyo. "And that might really impact how we look at our own defense posture." [...] In some ways, Mr. Kishida, a liberal-leaning member of a conservative party, may accomplish more to push Japan into its military future than did Mr. Abe, a right-wing ideologue who failed in his quest to revise the pacifist clause in Japan's Constitution.