Contract would likely be thrown out in court, but I don't see where jail comes into play. Nothing in the article suggested that there were criminal charges involved anywhere in here. I don't know anything about Russian law, but I'd be surprised if you can sue someone and get them put in jail.
Unless he put some additional correspondence in the letter indicating he'd altered the terms, his amendments seem to have been written in bad faith and should be invalidated. I don't grasp how fraud or deception committed by non-wealthy individuals is any less destructive or morally corrective.
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LOL, would they? It seems to me like a company can have a major breach of ethics, contribute to a global financial meltdown, and then not only avoid being punished but actually be rewarded with bailouts. I'm exaggerating, but I think it's pretty clear there is a double standard in how corporations are prosecuted as opposed to individuals.