Do they still need Finland as a "buffer state" [1]?
Yes and no. Had the Winter war not happened, Finland wouldn't have joined the German attack.
If it's all just a "cold war mindset".
And this is exactly what we are seeing in Kazakhstan: people riot over increasing cost of living and the president blames it on foreign agitators. Because that is easier and more convenient than actually engaging with the issue.
Not always.
See for example "US Army Field Manual FM 31-20-3, Foreign Internal Defense Tactics Techniques and Procedures for Special Forces". This one is outdated and was based on US operations in Central/South America.
I'm sure Russians have something similar.
Complete waste of resources from US side! Russia is very successful at making people in ex-USSR countries hate it as-is, making western propaganda completely redundant! But I know a lot of people who actively participated in Maidan revolution and are still waiting for their dirty CIA $$$. Hopefully Obama will pay his debts some day...
I participated in both (2004 and 2014). Where do I register for the "dirty CIA $$$"? I somehow missed it during the original briefing.