Conquering Finland might not be that hard now that they could attempt it with combined arms rather than just millions of poorly trained and ill equipped foot soldiers conscripted from the rural areas. Running these poor sods at the Mannertheim line with the NKVD behind their backs was comrade Stalin's way to do it. It's like whipping a bunch of kindergarteners untill they can pull a truck up a hill. Enough kindergarteners and enough whipping and it can probably happen.
Now though that land connection to Finland and the improved infrastructure on it would mean that Russia will have an easy time to provide logistics for its tanks, artillery, airforce and so on. Oh, and modern day missile cruisers will cause heaps of trouble for the finns as well.
In the case of a 1v1 war between Russia and Turkey where nukes are banned I don't see how anyone can favour Turkey. The Russians can have a safe route through Georgia (Russian-Georgian relations are pretty warm) and just roll over Turkey. Alternatively they can gather their fleet and choke Istanbul out. It will be harder to land troops through the Black Sea or to get permission to pass through Romania and Bulgaria. But it's possible.
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