Ukrainian authorities uncovered a corrupt arms procurement deal worth nearly €36.4 million, the Ukrainian security service announced late Saturday.

Former and current “high-ranking officials” in Kyiv’s defense ministry were involved in the plot, dating to 2022, to steal funds meant for procuring 100,000 mortar rounds, the Security Service of Ukraine (SBU) said in a statement.

The scheme reflects Ukraine’s ongoing struggle to combat corruption as it tries to fight off Moscow’s invasion and apply to join the EU and NATO.

According to the SBU, the defense ministry paid for the weapons order in August 2022, transferring the funds to supplier Lviv Arsenal. Instead of delivering the weapons, however, the company “took the received funds into the shadows, transferring them to the accounts of another affiliated structure in the Balkans,” according to the statement.

The SBU said it seized the stolen funds and notified five people of suspicion, including the former and current heads of the department responsible for military equipment at the defense ministry. One suspect is in custody after being detained while trying to leave Ukraine, the SBU said.

Ukrainian President Volodymyr Zelenskyy has compared corruption to treason. Yet his move to hand graft-fighting authority to the SBU — a unit under his direct control — rather than existing corruption watchdogs has sparked controversy and fears that sensitive cases could be covered up.