Owing to technical problems, Visa credit card transactions across Europe were being declined.
"We are currently experiencing some technical problems in our card transaction processing," London-based Visa International said in a statement. "In some cases, this is resulting in card transactions being declined."
Payment Business Services, a Danish company that handles credit cards transactions, said in Copenhagen that it began noticing technical problems with Visa transactions shortly before 5 a.m. (0300GMT), with Visa transactions being rejected two hours later.
Visa International said it first noticed problems in Britain midmorning. The company said it did not have a figure for the total number of transactions affected.
"Immediate action is being taken to overcome this problem and we hope to have a full service resumed as soon as possible," the statement said.
"We should use shock therapy to sober up the Americans. In this case, the Americans will speak about the need to resume dialogue. There is no other option"
The United States is concerned about the current crisis in the relations with Russia and suggests returning to reasonable policies to avoid a nuclear war