Senior Pentagon officials gave a classified briefing on the Patriot-3 (PAC-3) anti-missile system to senior personnel of the Indian Air Force, Navy and Defence Ministry here Sept. 9, a move that shows Indo-U.S. defense ties are growing in the wake of Indian Prime Minister Manmohan Singhโ€™s July visit to Washington.

Air Force Lt. Gen. Jeffrey Kohler, who directs the Pentagonโ€™s Security Cooperation Agency and led the delegation, said U.S. officials are not pressing India to buy Patriots but would like to hear what kind of missile defenses India wants .

No further details were made available on the classified PAC-3 briefing .

Kohler said the briefing is part of the Next Step in Strategic Partnership, a nine-month-old effort to narrow the two countriesโ€™ differences over non proliferation, encourage cooperation in missile defense and facilitate the flow of U.S. technologies to India โ€” particularly in civilian nuclear and space programs .

Indiaโ€™s official willingness to cooperate on missile defense dates from May 2002, under the previous National Democratic Alliance government . New Delhi asked about the PAC-3 system during an August 2003 meeting of the Indo-U.S. Joint Defense Policy Group in Washington, a Defence Ministry source said. India received a similar classified briefing on the Patriot-2 system in February .

Indian Defence Ministry sources said Russia is pressuring India to forgo U.S. anti-missile systems. Russian officials have said they will not provide the source code to allow the PAC-3 to be integrated with Indiaโ€™s existing Russian-made systems .

Senior Pentagon personnel also briefed officials here on the F-16 and F-18 fighter jets and the P-3 Orion maritime surveillance aircraft. India is looking to buy 126 multirole medium-range combat aircraft under a $6 billion program dubbed MRCA.

Sources said teams from Boeing and Lockheed Martin met separately with Indian Air Force officials to discuss their aircraft.