Part of the threat to Russia appears to be cultural.Probably.
14 nations have joined NATO since 1990.
NATO is a threat to Russian influence of Europe.
Each nation that joins NATO diminishes that influence.
Just like the US, we want to increase our influence in Europe for our security.
Western culture seems a threat to Russian political power.
All that gay marriage, atheism, liberals, protests,
multi-culturalism, & anti-government free speech.
Putin wants something more Christian...Russian
Orthodox in flavor.
Some argue that it's all about money...capitalists
are behind all the war. But Putin, who also has
much wealth, appears to desire recapturing former
glory of the Soviet empire. Economic sanctions
would more than offset any personal financial
gain from annexing Ukraine.