War between NATO and Russia=Nuclear war

[mapuc]

I know some of you have a lot more knowledge about warfare and doctrines when it comes to war.

I'm in a few discussion with my FB-friends where we discuss:

Posting of Danish soldiers in Estonia
and
the discussion of a report from The Defense Committee
Said following in their report
An armed attack from Russia against Sweden kan not be ruled out

In both of these discussion friends friend have said

NATO will help Sweden
And
If Russia attack Estland it means war with NATO

In both of these discussion I have said

A war between NATO(including USA) and Russia means Nuclear war.

Some of my friends and others said this will not happen.

Maybe they are right about that
I hope I'm wrong and all I have learned about military doctrines and other things are wrong.

Markus