"We surely want to talk to Medvedchuk. We invite him to come and testify," SBU's main investigative department chief Hryhorii Ostafiichuk said following the interrogation of Spravedlyvist (Justice) party leader Valentyn Nalyvaichenko.
"We very much want to hear Medveduk speaking. Let me use this opportunity to invite him to come to us," he said.
According to Ostafiichuk, the SBU has already summoned Medvedchuk for questioning in this case, but he made no appearance.
"We invite him to come and fulfill his procedural obligations," he added.
The SBU is investigating a criminal case under Part 2 of Article 332 of the Criminal Code of Ukraine (illegal border crossing) involving former Security Service head Valentyn Nalyvaichenko and Viktor Medvedchuk.
Medvedchuk is suspected of flying from Ukraine to Russia without passing customs and border control.