Zelensky didn't accused them collaborating with Russia. Problem is that there is huge number of people who collaborate with Russia in SBU and Prosecutor's Office. It's one of resone why Russia took Kherson so easy without much resistense. And heads of SBU and Prosecutor's Office is responsible for it.
BTW, Ivan Bakanov is old childhood friend of Zelensky, they also worked together in Kvartal 95 Studio.
I think it is safe to say that the special operation to eliminate any anti-Ukrainian elements in Ukraine has started.
Ukraine should have done this in 1991 as the Baltic countries did.
After this Putin's clusterfuck is finished, all pro-Russia terrorists will be eliminated or will leave Ukraine.
I think the Russian zombified population will support him until about 500 thousand Russian men will die (in a few years).
Maybe sooner. Public opinion can change very quickly once the general mobilization is declared.
I think in the end, Ukraine will be cleansed from any pro-Soviet/RF elements which will be good for the future of the country.