WASHINGTON (Reuters) - The United States imposed sanctions on two leaders of the Russian hacktivist group Cyber Army of Russia Reborn on Friday, citing their roles in targeting U.S. critical infrastructure, the Treasury Department said.

Yuliya Vladimirovna Pankratova and Denis Olegovich Degtyarenko are the group's leader and a primary hacker, Treasury said in a statement.

Their group, known as CARR, has conducted cyber attacks in Ukraine and countries and companies that support it. Last year, CARR started to claim attacks on multiple critical infrastructure projects in the United States and Europe, it said.

"CARR and its members’ efforts to target our critical infrastructure represent an unacceptable threat to our citizens and our communities, with potentially dangerous consequences,” said Under Secretary of the Treasury for Terrorism and Financial Intelligence Brian Nelson.

(Reporting by Doina Chiacu; Editing by Rod Nickel)