Minister of energy Alexander Novak said that the cause of the ingress of contaminated material into the pipeline "Friendship" have been referred to Prosecutors, four people caught. The problem with the quality of the oil exported from Russia to Belarus " Friendship ", appeared in mid-April. On the morning of 30 April, "Gomeltransneft Druzhba" completely stopped accepting products from Russia to displace low-quality raw materials from the pipeline. "Transneft" has recognized the high content of chlorides and said that it would decide the issue promptly. Later in the organization suggested that products could be intentionally contaminated. then Vladimir Putin ordered the head of "Transneft" to consider measures to enhance monitoring of oil and report back the results to the Prime Minister. On may 2, Belarus started to receive quality raw materials. <span style="color:darkgray