Exactly the same way the Russians are uneasy about Chernihiv, Western countries are uneasy about Kaliningrad with it's nuclear-capable Iskander-M missiles.

https://metro.co.uk/2025/06/17/russia-upgrades-nuclear-sites...

Geopolitics 101 also says that in a war between countries armed with ICBMs delivering nuclear weapons, distance doesn't matter, everyone dies. Especially with second-strike capability like Dead Hand (Sistema "Perimetr").

https://en.wikipedia.org/wiki/Dead_hand