In February 2004, he became deputy Head of the Security Service of Ukraine (SBU), responsible for legal issues of the service. On September 8, 2005, Drizhchany was promoted to head of the Service.
Lieutenant General of Justice.
He was dismissed by parliament in December 2006. Valentyn Nalyvaichenko became acting chief and remained in that position owing to the feud between President Viktor Yushchenko and Prime Minister Yulia Tymoshenko, who opposed Nalyvaychenko's appointment as permanent chief. In a surprise vote on March 6, 2009, Nalyvaychenko was confirmed as chief of the Security Service of Ukraine. January 28, 2009 Valeriy Khoroshkovsky was appointed First Deputy Chief of the SBU. On March 11, 2010 Khoroshkovsky was appointed head of the SBU by the Ukrainian Parliament.
- "President appoints Ukraine's chief customs officer Khoroshkovsky as SBU first deputy head". National Radio Company of Ukraine. January 28, 2009. Archived from the original on March 3, 2012. Retrieved June 21, 2010. (in English) (in German) (in Romanian)
- "Parliament appoints Khoroshkovsky SBU chief". Kyiv Post. March 11, 2010. Retrieved June 21, 2010. (in English)
- (in English) Head of Service page at SBU's Official web site
- (in English) Igor Drizhchany's Complex Inheritance