DF-5B

The DF-5B is an intercontinental-range member of China's DF-5 family, a large silo-based, liquid-propellant ballistic missile line. CSIS identifies the broader DF-5 as a 32.6-meter, two-stage liquid missile with an operational range around 13,000 km, while the DF-5B variant is important because it can carry multiple independently targetable reentry vehicles. That distinguishes it from earlier single-warhead DF-5A configurations. On a detail page, the DF-5B should be framed as a strategic nuclear delivery system, not a theater missile or conventional battlefield weapon.

DF-5B's technical character comes from the tradeoff between payload and survivability. The missile's liquid propulsion and large diameter allow a heavy payload and MIRV carriage, but it remains tied to silo basing rather than mobile launch. NASIC lists the CSS-4 Mod 3 ICBM as a liquid, silo-based Chinese system with multiple warheads and a 12,000 km-plus range class. This makes DF-5B a high-yield strategic asset, but one whose operational security depends on hardening, concealment, warning, and nuclear command-and-control rather than field mobility.

DF-5B matters because it modernized an older silo force instead of replacing it outright. CSIS notes the DF-5B became operational in 2015 and that its size is comparable to DF-5A while adding MIRV capability. NASIC also highlights China's first public display of the CSS-4 Mod 3 with a claimed MIRV payload in 2015. In strategic-force terms, this allowed China to increase potential warhead delivery from existing ICBM infrastructure while simultaneously developing more survivable road-mobile systems such as the DF-31 family and DF-41.