Erdogan is a cancer on the world. The US tag teaming Syria with Mr Bring Back the Caliphate, and how our great NATO ally Erdogan/Turkey supported Azerbaijan, and other brutal actions in the region and continues to is deeply troubling to me.
Russia is currently a Third World country with nukes. Russia has a shrinking population and low birth rate.
War with Turkey might just give the Russians more losses than Putin could politically tolerate.
https://www.cia.gov/the-world-factbook/countries/russia/
https://www.cia.gov/the-world-factbook/countries/turkey/