A wealthy Russian businessman and associates made tens of millions of dollars by cheating the stock market in an elaborate scheme that involved hacking into U.S. computer networks to steal insider information about companies such as Microsoft and Tesla, a prosecutor told jurors on Monday.

Vladislav Klyushin, the owner a Moscow-based information technology company with ties to the upper levels of the Russian government, is standing in trial in a Boston federal court nearly two years after he was arrested after landing in Switzerland on a private jet for a skiing trip.