He said this at a briefing on Friday, an Ukrinform correspondent reports.

"Today former Deputy CEO of NJSC Naftogaz of Ukraine Korniychuk was declared a suspect and placed on the wanted list. Using this opportunity and knowing that he is on the territory of Ukraine and is still hiding from the investigation, I would like to say that he is advised to voluntarily come to the PGO, which will obviously influence the qualification of his crime," Lutsenko said.

According to him, "today, through international channels, we also appealed to our colleagues from Latvia to report suspicion to the owner of the Riga Shipyard, Vasily Melnik."

As reported, in 2011, Ukraine's state-owned enterprise Chornomornaftogaz purchased two jack-up rigs for $400 million each. Agreements were signed through intermediaries, which gave rise to suspect corruption. In 2013, Norwegian firm Ferncliff reported that in 2012 it sold its drilling rig via its subsidiary directly to Naftogaz for $220 million, while Naftogaz claimed to have bought it through the Riga Shipyard for $400 million.

op