Ignore the ridiculous "U.S. is coming for our nukes" for a moment, as it isn't worthy of discussion. But high-security IS.
Here's how you protect nukes... it's not hard. It's the same system set up to guard the tons and tons of gold in Ft. Knox, USA.
You build underground storage facilities upwards of 20 meters deep. Cargo elevators are used to lift the components up in time of emergency or need.
Layers of conventional security surround the complex; standard missiles, small arms, barbed wire, etc.
Here's the kicker - concrete water tanks hold enough water to flood the facility to 20 meters depth. Inside a concrete blockhouse is a special room with a big PANIC button. In case of a base attack, personnel occupy the room, and monitor. If the breach is successful, if it appears the base will fall, the button is pressed. The nuclear components are under water.
No light, mobile attacking force is going to have the equipment, expertise, and above all, time, to salvage the nukes.
It is a last-ditch thing, and would cause damage, but it would guarantee that nuclear weapons and such would not fall into enemy hands.
An alternative would be to flood the bunker with a non-persistent nerve agent, that will either degrade and clear on its own in a few days, or maybe fill the bunker with CO2, which is heavier than air and won't harm the materials. People need to think outside of the box with this sort of thing, go beyond men, guns, and barbed wire.
