President of Ukraine Petro Poroshenko has appointed first deputy head of the Security Service of Ukraine (SBU) Vasyl Hrytsak as an acting head of the agency.

A relevant decree was signed and published on the president's website on June 18.

Earlier this day, the Verkhovna Rada adopted a resolution to dismiss Valentine Nalyvaichenko as the SBU head.

Poroshenko then presented Hrytsak to the SBU staff as the acting head of the agency, a source told Interfax-Ukraine.

Colonel General Hrytsak, born 1967, is the head of the Anti-Terrorist Center at the Security Service of Ukraine, first deputy head of the SBU.

He has served in security agencies of Ukraine since 1990.