Iran confirmed Wednesday that it tested a missile over the weekend, but denies it is a violation of the UN Security Council resolution. Washington, however, calls the launch “absolutely unacceptable.”

National Security Advisor Michael Flynn said the US is putting Iran “on notice,” but did not elaborate about what that meant exactly. He did say, however, that the “Trump Administration condemns any actions that undermines security and stability in the region, or that places American lives at risk.”

Trump has criticized the UN resolution and the Obama Administration as being weak and ineffective.

“Instead of being thankful to the United States for these agreements, Iran is now feeling emboldened,” Flynn said at a news conference today.

The missile launched by Iran, according to Flynn, failed upon re-entry into the Earth’s atmosphere. Flynn further said Iran’s actions were a violation of UN resolution 2231 that states the country is not to “undertake any activity related to ballistic missiles designed to be capable of delivering nuclear weapons.”

Iran’s attempt to launch a missile above the atmosphere is a matter of testing a ballistic missile, in the view of the White House.