According to an news release on Thursday, the U.S. Internal Revenue Service and crypto investigation company Chainalysis have teamed up with Ukraine to target Russian Oligarchs that may be using cryptography to evade sanction.

The IRS Criminal Investigation division (IRS-CI), which provides tools for blockchain analysis to Ukrainian investigators, supports them. The IRS donated to Ukraine licenses of the crypto investigation company Chainalysis. Around 50 Ukrainian law officers took part in virtual training. In-person training is still to be completed.

In the announcement, IRS-CI Chief Jim Lee stated that “these trainings help participants hone digital investigative skills in order to trace the origin of blockchain funds and demask cryptocurrency transactions using cryptocurrency forensic tools.” Sharing tools protects not only the U.S. Financial System, but also the global economy.

Since Russia’s invasion, both countries have used cryptocurrency to fuel their war efforts evade the sanctions, and support humanitarian efforts. Crypto doesn’t appear to be a major factor in Russia’s war efforts. U.S. legislators are still concerned that Russian oligarchs may be using crypto to circumvent U.S. or European economic sanctions.

Yurii Vykhodets is a police colonel at the Cyber Police Department of Ukraine’s National Police. He said that Russia often uses virtual assets to fundraise, believing it possible to circumvent sanctions. The training is timely, and it provides a powerful impetus to more effective work in this area by the Cyber Police.

IRS-CI investigates financial crimes, such as tax fraud. The IRS has filed claims for nearly $44 billion in the past against the bankrupt crypto exchange FTX, and its affiliate entities. The U.S. Department of Justice has also launched an investigation to determine whether Binance allowed Russians to access its exchange in violation of U.S. sanction related to Russia’s invasion of Ukraine.

IRS-CI is currently conducting 23 investigations related to sanctions.

Read more: U.S. Internal Revenue Service files claims worth $44 billion against FTX Bankruptcy

James Rubin is the editor.