North Korea’s claim that Japan has breached a diplomatic “red line” by deepening security partnerships is less about Tokyo’s defence moves than about Prime Minister Sanae Takaichi’s decisive victory at the polls, analysts say, as a weaker mandate could have pushed her to negotiate with Pyongyang. With a commanding majority secured in Sunday’s election, Takaichi now faces fewer domestic constraints as she signals plans to expand Japan’s defence cooperation with Western partners and potentially...