Japan is quietly rebuilding its military and rallying Asian neighbors to push back against China, but Beijing is too big and too far ahead for Tokyo to stop alone.

• Trump's tariffs, pullout from international groups, and the Iran war have weakened US influence in Asia, leaving room for China to dominate the region.
• Japan's new Prime Minister Takaichi has opened up arms exports, raised defense spending to 2% of GDP, and hinted Japan would defend Taiwan if China attacks.
• China is furious and is hitting back with trade bans, radar lock-ons against Japanese jets, and huge fishing fleet drills that look like rehearsals for a Taiwan blockade.
• Japan is building a regional coalition with South Korea, the Philippines, and Australia, including warship deals and joint training agreements.
• The gap is still huge: China spends five times more on defense, has far more warships, and is the top trading partner for most of Asia, while Japan's population is shrinking fast.

Outlook: Japan likely cannot match China alone, but if Tokyo can pull regional partners into a NATO-style alliance, it could slow China's rise in Asia.