Most/all of China's 400 thermonuclear weapons use liquid fuel for the rocket motors. We have the capability to identify readiness (fueling) in real-time. It's the reason that China is livid about THAAD deployed in South Korea. Same goes for Russia (Romania THAAD installation) although they have modernized their arsenal to a large extent (60% solid fuels. Limited launch-on warning). All of our stuff is solid fueled. Our subs are parked off their coasts. Imagine multiple independent launches from the US, UK and France is just itching to go.
You cannot store the liquid fuel for rocket motors in the missile. It takes 30-40 mins to fuel a liquid-fuel rocket motor.
Tritium decay into He-3 requires replenishment and the Russians don't perform proper maintenance in that area. The boosted phase of the staged TU-design requires strict maintenance.
I'll look, but I'm almost positive China has medium and long range solid fuel ICBM's with nukes on top. Russia too. Hell China invented solid fuel rockets in the 15th century. And just playing devil's advocate, say they don't have any (which I know they do).. sure we can see them fueling a LF rocket, but we sure as hell can't launch on that alone. They could just be doing readiness drills as those rockets can be de-fueled just as fast. And Russia won't attack a NATO country, at least until it accomplishes whatever it's trying to accomplish in Ukraine. That was more to my point.
The Dong Feng 31 (simplified Chinese: 东风-31; traditional Chinese: 東風-31; lit. 'East Wind-31'; NATO reporting name CSS-10)[5] is a third-generation long-range, road-mobile, three stage, solid-fuel rocket intercontinental ballistic missile (ICBM) in the Dongfeng missile series developed by the People's Republic of China. It is designed to carry a single 1-megaton thermonuclear weapon. It is a land-based variant of the submarine-launched JL-2.
The Topol-M is a cold-launched, three-stage, solid-propellant, silo-based or road-mobile intercontinental ballistic missile.[11] The missile's length is 22.7 meters and the first stage has a body diameter of 1.9 meters. The mass at launch is 47,200 kg, including the 1,200 kg payload. Topol-M carries a single warhead with an 800 kiloton yield[1] but the design is compatible with MIRV warheads. According to chief designer Yury Solomonov, the missile can carry four to six warheads along with decoys.[12] It is claimed to have the highest accuracy of any Russian ICBM.[13] The body of the rocket is made by winding carbon fiber.