The National Anti-Corruption Bureau of Ukraine (NABU) nabbed Naftogaz state deputy board chairman Sergiy Pereloma on embezzlement allegations as part of a probe that also saw parliament's former energy committee chairman Mykola Martynenko detained.
Martynenko was picked up yesterday and could face up to 12 years in prison for allegedly embezzling USD 17.28 million (16.12 million euros) from Europe's largest -- and Ukraine's only -- uranium extraction and processing plant.
The deputy gave up his parliament seat under pressure in November 2015.
Yatsenyuk himself quit in April 2016 after a tumultuous spell that saw several respected technocrats who rose to power after Ukraine's 2014 pro-EU revolution resign over rampant graft.
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Martynenko and Pereloma are being held in temporary detention while their cases come up for initial review.
Strengthening Ukraine's anti-corruption bureau was one of the top demands of the International Monetary Fund connected to a USD 17.5 billion rescue package for Ukraine in 2015.
NABU was established in 2014 but its first detectives did not get to work until December of the following year.
Its headquarter were raided by prosecutors in 2016 in what NABU believes was an attempt by remnants of the old guard to halt its investigations into the upper echelons of power.
The former Soviet republic is 131st of 176 countries and territories on a 2016 Transparency International index where they are ranked from least to most corrupt.