Oil prices tumbled after unsuccessful negotiations of the countries-exporters in Qatar

On the London stock exchange the barrel Brent has lost seven per cent and costs a little more than forty dollars. So the market reacted at the failed meeting of Ministers of countries-members of OPEC. Officials are unable to agree on reducing oil production that could lead to an increase in its price. Obstacle was the position of Iran: oil industry of the country only recently lifted international sanctions, and to impose restrictions on our energy industry is not going to Tehran.