Visa and Mastercard have stopped providing services for payment transactions for clients at Russia's Bank Rossiya without notification, the sanctions-hit bank said.
The management of Rossiya understands the difficulties of clients in the current situation and will do all it can to solve them.
An unusually frank Nato Secretary General issued an unequivocal warning on the course of events should Russia attack Latvia or Estonia.
The West responds with sanctions and closer political ties with Ukraine as Russia's President seals the annexing of Crimea to much fanfare.
Supporters of the controversial fracking industry believe shale gas could be America's most potent weapon in the stand-off with Russia.