KYIV, Aug 2 – Some 31 international companies use the service of storing natural gas in Ukrainian underground gas storage facilities (UGS), Andriy Kobolev, the CEO of Naftogaz Ukrayiny, said on Facebook.

"At present, we have contracts with 31 international companies for storing gas in Ukrainian UGS. They have already pumped 1.4 billion cubic meters of gas into our storages and store it there in a customs warehouse mode - this figure significantly exceeds our expectations," he wrote.