At one time we were terrified of an attack from Russia.
The ICBM's from the old Soviet Union Days are still there and so is Russia.
Improved relations with Russia and agreements about arms control, etc helped reduce this.
The current Russia Hysteria is heating this up again, and it is very dangerous, perhaps more so than the NK.
To repeat an old quote from the Russian leader at the time:
"They would burn down the house to light a cigarette"