Col. Moammar Gadhafi went on a broad offensive Monday in a bid to shift momentum against Libya's uprising, as the White House imposed record sanctions against the embattled strongman and international leaders discussed clipping his wings by imposing a no-fly zone.

The government's efforts to regain recently lost territory indicates the regime is digging in for a long stand-off. Col. Gadhafi's opponents, including mutinous army units, hold nearly the entire eastern half of the country, much of the oil infrastructure and some cities in the west. In Tripoli, Col. Gadhafi's forces are reinforcing defenses as the city on Monday exuded an uneasy calm.

The international community redoubled its efforts to pressure Col. Gadhafi to surrender power in Tripoli. The U.S. Treasury Department on Monday froze $30 billion in assets controlled by Col. Gadhafi and his family, in what the Obama administration said was the single-largest seizure of foreign funds in U.S. history.

The Treasury's action comes on top of sanctions passed unanimously by the United Nations Security Council on Saturday and the European Union's own sanctions against the Gadhafi family.