MOSCOW, April 17 - Gazprom Export has hired an external auditor, FBK, to verify its commitments to supply minimal annual volumes of gas under contracts with European buyers who receive gas via Ukraine for the period 2012-2017.

The auditor will present the client with three letters of confirmation of volumes for each year in the periods 2012-2015, 2016 and 2017.

The agreement with FBK was signed not by Elena Burmistrova, the head of Gazprom Export, but by Sergei Sakharov, the acting general director, for a period of 12 months beginning December 12, 2016.