is mind-bogglingly awkward. A book-length essay could maybe do so, in some ways. But come on. Different goals, different people, different tactics, different cultures...different ideologies and therefore what does "left" even mean? Are you calling the current Egyptian gov't "left" because it came about as the result of the Arab Spring?
I'm starting to think there never has been a "left" movement that in any way overlapped with concerns for justice, human rights and progressive values. Look at the "left" of the 20th century--it became synonymous with Soviet totalitarianism, the opposite of progressive values, and look at "leftist" terrorists like Carlos and Badder Meinhof who worked with the Soviets, Hezbollah, Saddam, Gaddafi and other despots/extremists that were also the opposite of progressive values. This so-called "left" was synonymous with money-making psychos. The fact that Soviet Russia was just a scam is proven by the fact that Putin has continued the exact same game as the Communist, but with all the ideology removed. Before the totalitarianism, propaganda, invasions and stealing the country blind for the enrichment of a limited few was in the name of Communism--now the same thing is going on with no real ideology.
I don't think the anti-Putin and anti-war forces in Russia are necessarily "left." They might just be for democracy and freedom. That makes them pretty radical inside Russia but in terms of ideology, probably just regular centrist folks.
What is "the left"? I think you are just referring to "opposition."