Speaking form the east room of the White House this hour, Barack Obama took the opportunity to articulate (or at least give a US government face to) the resolution passed yesterday by the UN Security Council authorizing intervention in the Libyan conflict.

President Obama called on Libyan leader Muammar Gaddafi to immediately cease hostilities against his own people and allow humanitarian relief missions to enter Libya.

Obama stressed that this move is being done in concert with numerous allies, and that he was not committing US ground troops to the action, but beyond that, the speech was short on what specific role the United States would play.

As noted earlier, while Gaddafi’s government claims to have stopped its offensive against rebel forces, reports from inside Libya by opposition leaders say that government troops are still using lethal force.