Who is our nuclear umbrella?
Asking as a Dane.
Trump threatens invasion, France is going Le Pen, Starmer does his best to throw the UK to Farage.
Our best bet is probably a Nordic-Baltic-Poland-Ukraine alliance with nuclear deterrence. Ukraine and Poland have strong ground forces. Any of those governments might turn fascist, but all of them are close enough to Russia to still have a self-interest in a strong defense.
It's expensive, but a lot cheaper than war.