Beyond Deterrence: Evolving China-Russia Military Coordination and the U.S.-Japan Alliance

Center for Strategic and International Studies  |  Riho Aizawa

China-Russia joint strategic bomber flights in December 2025 demonstrated a highly coordinated, coercive pattern of military pressure targeting Japan below the threshold of war. This tenth joint flight featured nuclear-capable assets transiting the Southwest Islands along a trajectory pointing directly toward Tokyo, timed specifically to support Beijing's political coercion regarding Taiwan.

These operational maneuvers reflect a deepening bilateral alignment where Moscow actively reinforces Beijing's regional pressure campaigns. In response, the U.S.-Japan alliance executed rapid, large-scale bilateral exercises over the Sea of Japan, culminating in an unusual February 2026 deployment of four American B-52 strategic bombers alongside Japanese F-2 and F-15 fighters. While these massive allied counter-maneuvers temporarily halted subsequent strategic bomber flights, continuous intelligence-gathering operations by Chinese Y-9 and Russian IL-20 aircraft persist. This evolving security dynamic blurs the traditional boundaries between deterrence and compellence, forcing the alliance to adapt to sustained, multi-domain gray-zone coercion.

Comment

Deploying B-52 strategic bombers to counter joint H-6N flights over the East China Sea establishes a highly escalatory operational pattern. This reliance on heavy strategic aviation for routine interception duties accelerates airframe fatigue on the limited American bomber fleet while diverting assets from other global theatres. Furthermore, scrambling JASDF F-15 fighters to shadow these joint patrols places a continuous maintenance burden on Japan's frontline tactical squadrons. This friction increases the risk of mid-air mishaps during JASDF intercept manoeuvres near the Southwest Islands.

To read in details click here