Answer
Yulia Tymoshenko was the Prime Minister of Ukraine when Turchynov served as the First Vice Prime Minister. This was from 2007 to 2010, during the second term of her premiership. Tymoshenko was a controversial figure, and her premiership was marked by political instability and economic difficulties. She was eventually ousted from office in 2010, and Turchynov was replaced as First Vice Prime Minister by Serhiy Arbuzov.