Has Finland been actively fighting with Russia and killing Russians for years like Ukraine has? Russia was attempting to trade freely with other countries. But the US didn't like this, and started using Ukraine long ago to try to stop Russian free trade. Russia's invasion of Ukraine was only a defensive measure against the US, who was using Ukraine.
At this point, since there is much conflict already, and Russia has given Nato ultimatums that Nato is disregarding, why should Russia make more threats against Nato? When the time comes, Russia will have to get serious about war... and do it... against all of Europe and the US. And it seems like China and some other countries will side with Russia.
Russia doesn't want war. Russia wants free trade among nations. It's the US that is trying to conquer Russia and break her apart. They have said that they are trying to do this, and now they are showing it by supplying Ukraine militarily.
All countries talk. We see it in the news. The thing we don't see is the thing they are keeping private. We can't take media talk at face value. There are as many lies in the media as there are in the US and Nato, like their breaking of the Minsk agreements.
Finland joining Nato means nothing. It might even backfire on Nato since there are many Finns who are somewhat in favor of Russia. How do we know? There has been relative peace along the border of Finland and Russia for years or decades.
There is no international law that limits Nato from spreading and there is none that stops Russia from also expanding its influence through trade and diplomacy with other countries. Currently, Russia has gotten and still seeking new partnerships. We have recently seen the strengthening of BRICS which includes industrialized nations like Brazil, Russia, India, China, and South Africa.
Both Russia and NATO should allow nations to freely choose their association or partner without restrictions. Let America be also willing not to stop any of its neighbors from having military and political alliances with Russia.
It was not America that advised Russia to go to war, therefore you cannot blame the US for the war. Russia would have sought other means to reconcile her difference with the nation's neighbor. War was a political and military blunder because Russia thought the war will be short. There are some external influences from wars that are uncontrollable. Both Russia and NATO should drop their pride and accept that they wished that this war didn't happen. Both parties and the world is still suffering from the effect of this war.