The United States has warned that if Russia invades Ukraine, it plans to kill or send specific Ukrainians to camps.
The AFP news agency reported that the United States had sent a letter to the UN human rights chief.
The United States has expressed deep concern over the deployment of Russian troops near the Ukrainian border.
It noted that there was a possibility of a human rights disaster.
The United States says it has received credible information that it has identified some Ukrainians and is planning to kill them or send them to camps after the military invasion.
The United States has said Russian troops will use force to disperse peaceful protesters.
The letter to the UN High Commissioner for Human Rights said that Russia’s invasion of Ukraine could lead to abductions and harassment.
US Ambassador to the United States Bathsheba Nell Crocker has warned that political protesters, ethnic minorities or religions could be targeted.