Nazi Germany felt VERY confident they could take on the USSR, and they had the experience to do so... but it didn't work out at all.
The entire Operation Barbarossa was predicated on the Wehrmacht being able to smash the Red Army within 4 months. The German High Command was very well aware of the fact that they would run into significant logistical and manpower shortages if the USSR did not surrender in four months. That’s why they had to go with the blitzkrieg, it wasn’t some genius warfare, but a necessary tactics given the limitations of their logistics and manpower. Still, it took another 4 years and millions and millions of lives to defeat Nazi Germany.
I guess if this does turn into a prolonged conflict, it will be dependent on the logistical supply on both sides, and their capacity to ramp up military production as well as their allies’.
Do note that there is also a global trade war, or more precisely, a financial war going on where its economic impact can sway these countries toward one trajectory or the other. The effects of a global financial warfare are very complex and this could end with many surprising outcomes that nobody could have predicted.
You mean non-western leftists?
Because honestly most average people are apolitical and just don’t care that much about the world. If you only get your information from the internet and social media, it can seem like people are having certain sets of opinions, but once you actually go out and talk to people about the stuff we care about here, you’d find that most of them don’t even know what you’re talking about.