Terminology.
Not nuclear sites.
ICBM sites. ICBM sites certainly have to launch if targetted, and as I just noted, if the intention of the article was missiles that are not ICBMs then there is no reason Russia can not base them next to the ICBMs.
Incoming threats then force an ICBM launch.
I still don’t see what you guys are talking about, this is Russia saying they will launch nuclear weapons if Ukraine tries to interfere with the sites that Russia is using to attack Ukraine’s cities with conventional missiles.
In July it was threatening WWIII nuclear war for something else.
“Former Russian president warns of nuclear response if Ukraine counteroffensive is successful”
https://thehill.com/homenews/4128618-former-russian-president-warns-of-nuclear-response-if-ukraine-counter-offensive-is-successful/
The article said nothing about limiting the sites to “ICBM sites.” In fact, the descriptor “ICBM” is nowhere to be found in the article.