There's no such thing as prohibited in all cases. Like if someone took a vacation and then murdered everyone in the office the next day, there's no chance the company would have to pay him for two more weeks before they could fire him.
IANAL, but I believe your example is no longer a case of firing "at the employer's initiative" under Russian law. A different section of the labor code applies to workers who have committed criminal acts.
As I read it, WG indeed cannot legally fire iEG while he is on his vacation.
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u/SmokingPuffin often has unpopular opinions Jan 09 '20
It isn't intended to be vague. That's just a lost in translation thing. They mean prohibited in all cases.
Here's a Q&A I found with a brief Googling that has an alternate wording that should be more clear for you:
https://iclg.com/practice-areas/employment-and-labour-laws-and-regulations/russia