"Allowing 100 per cent FDI in defence sector means India's defence sector is thrown mostly into the hands of Nato- American defence manufacturers," senior party leader and former Defence Minister A K Antony said in a strongly-worded statement.
Noting that it is immediately after Prime Minister's US visit the government has brought "sweeping" changes in the FDI policy, he alleged it posed a "big threat" to national security and India's independent foreign policy.
It is "very important" to note that all such changes happen immediately after Modi's recent American visit.
Turning to the joint statement issued by Modi and US President Barack Obama, he claimed it resembles like India has become a "security partner of America".
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Noting that the statement says that both India and America will work together as equal partner for peace and security of Asia-pacific region, he said the announcement in the joint statement about the cooperation between India and America to ensure the security of Gulf and West Asia will also create "very serious problems".
"I strongly condemn this move. It is against the interest of the country and its people. I also urge Modi government to withdraw the decisions affecting national interest," he added.