As reported by Censor.NET, he said in an interview with Ukrainska Pravda.
"The case is actually probed in leaps and bounds. We already have 20 suspects," he said.
Sytnyk added that he viewed this case as an opportunity to return considerable amount of embezzled money to the state budget.
"We did not figure out the exact amount on Onyshchenko's case alone. But there are a lot of bank accounts as well as movable and immovable property. The amount is shaping up to be large," he said.
According to Sytnyk, the case is complicated, but the entire scheme has already been unveiled, and the case files are currently being referred to the Interpol. He also added that the reaction of the British law enforcers was critical as Onyshchenko was known to stay in London.
"I hope that the UK, which has made a great contribution to the creation of NABU, would decide in favor of [Onyshchenko's] extradition after all. I do not rule out that he could leave the UK and stay in another country. These are the issues to be tackled by the international investigation authorities," he added.
According to him, NABU will do its best to refer the case to the court as soon as possible adding that some of the case files have already been submitted. He also assured that Onyshchenko's corrupt practices on gas market were curbed.
On March 16, the NABU raided the office of Oleksandr Onyshchenko. It stated the searches were carried out under the pre-trial investigation of criminal case initiated into abuse of office during the sale of natural gas extracted jointly with Ukrhazvydobuvannia SE.
Later, the NABU requested the Prosecutor General's Office (PGO) to lift the immunity of people's deputy Oleksandr Onyshchenko. Moreover, the NABU and the PGO claim Onyshchenko is involved in embezzlement of 1.6 billion hryvnia (approx. $64.02 million).
On June 16, Prosecutor General Yurii Lutsenko issued a motion requesting Verkhovna Rada's consent for criminal prosecution, detention, and pretrial confinement of Onyshchenko. On July 5, the parliament approved the detention and arrest of the people's deputy.
The suspect himself stated he was busy with the preparation for the upcoming Olympics and not going to react to NABU's actions. On July 29, Onyshchenko said he was in the UK and had applied for political asylum.