The United States has said it was preparing more sanctions against Moscow over the attempted assassination of a former spy, Sergei Skripal.
British investigators said Russian operatives on March 4 tried to kill Sergei and his daughter Yulia Skripal in the English city of Salisbury.
The State Department told Congress on Wednesday in a legally-mandated follow-up that Moscow had not come into compliance.
State Department spokeswoman Heather Nauert said in a statement that “We intend to proceed in accordance with the terms of the (Chemical and Biological Weapons) Act, which directs the implementation of additional sanctions.”
She said the State Department was in discussions with Congress, which has led the push to punish Russia, to determine the exact measures.
Russia has denied involvement in the Salisbury attacks and has promised reciprocal measures to all US sanctions.