MOSCOW—Russian ratings agency ACRA estimates that the country’s banks imported $5 billion worth of banknotes in foreign currencies in December, up from $2.65 billion a year before, in a preemptive step in case of sanctions creating increased demand. Dollars traditionally dominate such imports which, along with other currencies, many Russians like to hold as a hedge against any drop in the value of the rouble or rise in inflation, both potential outcomes of foreign sanctions. Valery Piven, senior director at ACRA, told Reuters that calculations based on technical reports which banks submit to Russia’s central bank each month showed that they had also imported $2.1 billion in foreign banknotes in November. “The ratio of forex assets and liabilities held by banks is regulated by the central bank and [currently] does not cause a concern. The increase in [forex] imports is more related to a possible spike in demand for cash …