sentences:  As a result, in the interest of national security, the U.S. began to push for greater control over the CASOC concession.On 16 February 1943, President Franklin D. Roosevelt declared that "the defense of Saudi Arabia is vital to the defense of the United States", thereby making possible the extension of the Lend-Lease program to the kingdom.Later that year, the president approved the creation of the state-owned Petroleum Reserves Corporation, with the intent that it purchase all the stock of CASOC and thus gain control of Saudi oil reserves in the region.