The U.S. Internal Revenue Service (IRS) and Chainalysis are collaborating with Ukrainian investigators to target Russian oligarchs who may be using cryptocurrency to evade sanctions. The IRS is providing blockchain analysis tools to approximately 50 Ukrainian law enforcement officers through licenses donated by Chainalysis. The training is aimed at improving digital investigative skills to trace the source of blockchain funds and unmask cryptocurrency transactions. The move comes as concerns remain that Russian oligarchs could be using cryptocurrency to circumvent U.S. and European economic sanctions.