1. Get inside fast.
2. Stay inside.
3. Shower and shampoo and put your clothes in a separate bag.
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my FIL (worked at Lawrence Livermore Labs) had a bomb shelter in his back yard…and we kids were well schooled in how to quickly get under our desks with hands over our heads.
Fortunately, the shelter eventually became a fully stocked wine cellar ;-)
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...Assume you are at the margin of the strike, and protect yourself from falling debris (e.g., the roof of the building you are in). After the shock waves pass, gauge wind direction and seek shelter from fallout.
If you are in the main blast area, you are dead (even under that protective desk :-) ). But, you never know if the Russian nuke is going to hit dead center. It probably won't. Those under the desks (or with comparable or better protection) at the margin of the blast have a greater chance of surviving. Even a simple street curb can be enough to shield you from the shock wave if you are far enough out. In the Army, they taught us to fall down toward the flash, so helmet was facing the flash, body parallel to the travel direction of the coming shock wave. Tuck in your hands covering your face (while staring at the ground); flatten your heals, and wait, because the shock wave follows the flash. You never know if you are far enough out to survive, but you stand a better chance than standing there waiting for the shock wave.
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