Ukraine imposed sanctions on former president and opposition politician Petro Poroshenko, including an asset freeze and a ban on withdrawing capital from the country, for what the domestic spy agency said on Thursday were “national security” reasons.

Former President Petro Poroshenko said on Wednesday that Ukraine’s National Security and Defence Council had adopted sanctions against him, and he accused political rival President Volodymyr Zelenskiy of being behind the move.

In an unprecedented move, President Volodymyr Zelensky imposed sanctions on his predecessor and key political rival, lawmaker Petro Poroshenko. Poroshenko, who was elected president in 2014, lost his reelection bid in 2019 to Zelensky in a bitter campaign that often included personal attacks.