As this is from Russia and possibly the Russian Mafia, he has done the worst possible thing. He should have kept quiet and paid up in full.
The Russian Mafia play super hard ball and don't take anything from anyone. They are even more extreme than the original Italian Mafia
If they come on the scene, all you should ever do is comply with their demands. There is not a force on Earth that can protect you if you upset these honourable and decent upright Gentlemen.
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Cyber Devils Advocate (Retired)
Fame, Riches, Adventure, Glory - A Cyber Warrior craves not these things
In Memorium
Wendy (AKA Romantic Old Bird) 1951 - 2008