The comments come as Syrian President Bashar Al Assad's regime, which is supported by Russia, continues to carry out airstrikes over the rebel-held enclave of Eastern Ghouta just outside Damascus.
The United Nations Security Council had demanded a ceasefire in Syria two weeks ago to allow nearly 1,000 sick and wounded civilians to leave so they can seek urgent medical treatment. On Monday, the U.S. threatened to "act if we must" if the UN ceasefire resolution continues to be ignored.
U.S. Ambassador to the UN, Nikki Hailey, said Monday that the U.S. was drafting a new ceasefire resolution with "no room for evasion" and warned the country was prepared to act.
"It is not the path we prefer, but it is a path we have demonstrated we will take, and we are prepared to take again," Haley told the UN Security Council on Monday.
"When the international community consistently fails to act, there are times when states are compelled to take their own action," she added.