Ukraine has suspended oil pumping through the Druzhba pipeline in the direction of Hungary, Transneft spokesman and presidential adviser Igor Demin told RIA Novosti.

"The Ukrainian side has informed us that they have suspended pumping in the direction of Feneşlitke (Hungary, - ed.) due to a voltage drop," he said.

For its part, the Hungarian oil and gas company MOL said it was closely monitoring the situation at the pipeline. They also clarified that the country's oil reserves will be sufficient for three months.

Hungarian Prime Minister Viktor Orban called a meeting of the Security Council in connection with the incident.

The Druzhba pipeline is the longest in the world, its length is about four thousand kilometers. It starts in the Samara Region, passes through Bryansk and then branches out into two sections: the northern one - through Belarus, Poland and Germany and the southern one - through Ukraine, Czech Republic, Slovakia and Hungary.