Traditionally western aligned non nato countries are probably safe from Russian aggression. Finland and Sweden are 2 votes away from joining NATO as it is. America just has to park troops and equipment in any threatened country and they are essentially immune from invasion. Their military is also a good deal better equipped that Ukraine's was. Finland has the largest artillery capability in western Europe and a strong anti - air capability. Short of nukes, I'm relatively certain Finland would chew up any invading Russian force, especially as depleted and exposed as they are from the war in Ukraine.

Yeah, high-up Russian politicians have been talking about invading Finland or Poland or both.

And if the GP says that they don't have the military strength to pull that off, well, they don't. But they don't have the military strength to defeat Ukraine, and yet the fighting goes on, in complete defiance of sanity. No, Russia can't (successfully) invade either place. That doesn't mean he won't try. If I were Finland or Poland, I'd be preparing hard right now.