I am not a lawyer, but, as a Russian citizen, let me warn you. The very fact that your comment criticizing the EU regime, that you yourself admit could send you to jail, is online and not deleted by Thursday, makes it a "lasting crime". For lasting crimes, it does not matter that the regulation criminalizing the action or state of affairs was not in force when they started. What matters is that the condition defined as illegal (comment existing) is true when the regulation outlawing it is in force - i.e., that you did not cease and desist. Yes, this is a creative way authorities circumvent the ban on ex post facto laws - they say "it is not ex post facto".

Commented on Tuesday, deleted the comment on Wednesday, the regulation is enacted on Thursday => OK.

Commented on Tuesday, did not delete before Thursday => jail (and it does not matter that you can't delete it anymore because it has a reply).

Sarcasm of course, as Russian laws do not apply here.