Ukraine’s anti-corruption bodies said on Saturday they had uncovered a major graft scheme that procured military drones and signal jamming systems at inflated prices, two days after the agencies’ independence was restored following major protests.

Ukraine’s anti-corruption agencies said four people had been detained in a probe into “large-scale” corruption in the procurement of drones and jamming systems.

According to investigators, officials involved in the scheme allegedly received up to 30% of contract funds as kickbacks. Among those detained are lawmaker Oleksii Kuznetsov and former Luhansk Oblast Governor Serhii Haidai.