For those of us that remember the left of the early and mid 1970s, it is sure strange to be experiencing it all again from an element here at FR.
I don't know if you're ascribing opposition to US intervention in Ukraine as leftism...or just wrong-headedness.
I understand that many people who do not undertake any serious study of the facts could do either, or worse: Accuse those who do not support intervention as supporters of Putin, Slavic Fascist Imperialism and Treason against the USA.
If anyone who is an advocate for either side in Ukraine thinks they have some sort of moral high ground they are either delusional or corrupt. Both sides are lying, ruthless murderers.
And Putin probably started it, at least the overt stages.