KYIV: Ukraine's anti-corruption agency said security services were preventing officers from raiding the parliament on Saturday, as investigators said some MPs were implicated in a new graft probe.

Ukraine was embroiled in a string of corruption scandals that led to the resignation of the chief of staff to President Volodymyr Zelensky. They also revealed a $100 million kickback scheme in the battered energy sector, masterminded by an alleged personal friend of the president.

"NABU and SAPO, following an undercover operation, exposed an organised criminal group that included current members of parliament," the National Anti-Corruption Bureau (NABU) said.

"Employees of the State Security Department are resisting NABU officers during investigative actions in committees of the Verkhovna Rada of Ukraine," it added, referring to Ukraine's parliament.

The anti-corruption agency did not reveal details related to the investigation.