However, I have been absolutely shocked that their view generally is that while Putin is in the wrong he has had no choice really due to aggression from The US and NATO
You are shocked that the propaganda machine in Russia has actually worked to convince some of the people that the Russian leader is correct in his actions? That’s literally the purpose if it!
Interesting that you think it's propaganda to point out facts.
In 1990 the Soviet Union, as it was collapsing, made a deal with NATO to allow German unification as long as there were written “ironclad guarantees”, that NATO would not expand one inch eastward.
Not long after Germany started reunification talks and what did NATO do? Just the 5 expansions eastward. NATOs refusal to rule out further expansion into Ukraine is also why the Minsk Agreements failed.
I've asked this before but never get a response.
If the roles were reversed and Russia had set up an organisation specifically designed to contain UK or USA aggression and had managed to get Poland, Ukraine, Belarus, Iran, Turkey, etc to sign it at the start and then promised not to expand it anymore. Then decided to ignore that and extended the alliance out to Germany, Netherlands, Denmark and Cuba, and was now actively trying to get Mexico or France to join too, what do you think the UK and US response would have been?