Japan’s defence minister is touring Southeast Asia this week with what analysts describe as a clear, if diplomatically understated, mission: turning Indonesia and the Philippines into harder targets for Chinese maritime ambition. Shinjiro Koizumi landed in Jakarta on Monday to sign a defence cooperation pact with his Indonesian counterpart Sjafrie Sjamsoeddin, coming hot on the heels of Tokyo’s landmark decision to lift a decades-old ban on the export of lethal weapons last month. He heads next.