Russia's energy giant Gazprom has said it cannot fulfil its gas contracts with Europe.Russia’s energy giant Gazprom has said it cannot fulfil its gas contracts with Europe.

Russia is threatening to send less gas to Europe, but Germany is rejecting the idea.

It is not in a position to fulfill gas contracts with Europe due to unforeseen circumstances.

Uniper told CNBC that Gazprom had claimed force majeure. When unforeseeable circumstances prevent one party from fulfilling its contractual duties, force majeure can occur.

We have received a letter from the company in which they claim force majeure for past shortfalls in gas deliveries. Lucas Wintgens, spokesman for Uniper, told CNBC that the force majeure claim was rejected.

RWE confirmed to CNBC that it had received a force majeure notice.

When contacted by CNBC, Gazprom was silent.

The possibility of a complete shutdown of gas supplies from Russia has become a concern for officials in Germany and other European countries. After the shut down of the main gas line from Russia to Germany, some doubted that flows would be fully restored by July 21.

Europe received 40% of their gas imports from Russia. European officials have been trying to end this dependency, but it is hard to do in a day or two.

As it seeks new suppliers of fossil fuels, the European Commission has announced new gas deals with the United States and Azerbaijan.

According to the head of energy analytic at ICIS, this is the first time in history that this has been done.

The European Union did not reduce the price they paid for oil in Russia.

Lower flows from Russia have caused European gas prices to go up. Russia can make the same amount of money as before because of the higher prices. This is the "offsetting effect."

The Dutch TTF hub's front-month gas price was 1% higher at 159 euros per megawatt-hour Tuesday morning. Over the last year, prices have doubled.