UN ambassador Nikki Haley seemed to hint at a possible US intervention in Syria on Wednesday during a UN Security Council meeting.

During her address to the council, Haley harshly condemned the gas attack in Syria that killed dozens on Tuesday.

She slammed Syrian President Bashar al-Assad’s regime as “barbaric” and said Tuesday’s attack had “all the hallmarks of the Assad regime’s use of chemical weapons.”

Assad was previously blamed by the international community for a chemical weapons attack that killed 1,400 Syrians on the outskirts of Damascus in 2013. A UN report last August explicitly singled out Assad’s forces and said they used chemical weapons in the town of Talmenes in 2014 and Sarmin in 2015.

“When the United Nations consistently fails in its duty to act collectively, there are times in the life of states that we are compelled to take our own action,” Haley said, appearing to allude to the possibility of US intervention in Syria if its citizens continue to be attacked.

Haley also specifically singled out Russia and Iran for what she called complicity with the Assad regime.

Iran has reinforced Assad’s military, and Russia has shielded Assad from UN sanctions,” she said.