The hackers were working with a unit in the Russian Main Intelligence Directorate, according to the DOJ.

Amin Timovich Stigal is alleged to have participated in attacks dubbed “WhisperGate” ahead of Russia’s 2022 invasion of Ukraine.

The British statement cites joint U.K./U.S. intelligence, representing the most formal U.S. attribution to date.

The wiper could add to the woes of a country increasingly under physical and cyber assault.

The attack is the latest salvo in cyber activity related to military tensions between Russia and Ukraine.

The NotPetya attacks crippled businesses around the world and led to an estimated $10 billion in costs.

Ukraine is more explicitly blaming Russia for the cyberattacks.