UNITED NATIONS (AP) — The United States warned Russia on Friday that any further intervention in Ukraine, including under the pretense of delivering humanitarian aid, would be viewed as “an invasion of Ukraine.”

U.S. Ambassador Samantha Power delivered the warning at a Security Council meeting focusing on the human rights situation in Ukraine’s east, where government forces are fighting pro-Russian separatists. Recent reports by the West and the Kiev government have accused Moscow of dispatching what NATO estimates is 20,000 troops to the border.