The sanctions banned any Americans or people in US jurisdictions from any new medium or long-term financing transactions with VTB Bank, its subsidiary Bank of Moscow and Russian Agricultural Bank.
All three are controlled by the Russian government.
The sanctions aim at choking off anything but short-term financing for the banks, which could inhibit their ability to build or maintain long-term lending business. Under the rules, are prohibited from transacting in or providing financing for any new debt from the banks for over 90 days.
