United Energy Systems of Ukraine, (UESU), was a natural gas trading company in Ukraine. In the years 1995 and 1996, it was the largest natural gas importer in Ukraine. The company was affected by a series of financial irregularities leading to criminal charges against the principals and closure of the company in 2009.

Yulia Volodymyrivna Tymoshenko is a Ukrainian politician, who served as Prime Minister of Ukraine in 2005, and again from 2007 until 2010; the first and only woman in Ukraine to hold that position. She has been a member of the Verkhovna Rada as People's Deputy of Ukraine several times between 1997 and 2007, and presently as of 2014, and was First Deputy Prime Minister of Ukraine for the fuel and energy complex from 1999 to 2001. She has a degree in Candidate of Economic Sciences.