RIYADH - The United States and Saudi Arabia agreed to increase support to Syria's moderate opposition while seeking a political resolution of the four-year conflict, the US State Department said after Secretary of State John Kerry met King Salman on Saturday.Kerry was in Riyadh for meetings with the Saudi monarch, crown prince, deputy crown prince and foreign minister - the last stop in a trip that also included Vienna, where he met counterparts from Saudi Arabia, Turkey and Russia."They pledged to continue and intensify support to the moderate Syrian opposition while the political track is being pursued," the State Department statement said after Kerry's meetings in Saudi Arabia. It did not spell out what kind of support would be offered.Rebels have appealed for more military support from foreign backers, including Saudi Arabia, to confront major Syrian army offensives. Those offensives are backed by Lebanese Hezbollah and Iranian fighters and Russian air strikes.The United States and Saudi Arabia, together with other states opposed to Assad, already provides some military support to Syrian rebels. That includes training by the Central Intelligence Agency and anti-tank missiles.