The defence agreements -- called foundational -- are used by the US to facilitate defence cooperation with foreign military partners, senior defence officials said.
These are routine agreements and to date the US has signed more than 100 such agreements with its partner countries around the world.
In an interaction with Indian journalists based here, three senior defence officials said the proposed foundational agreements are aimed at facilitating the exchange of classified information and sensitive technologies between the two countries.
Of the four foundational agreements, General Security Of Military Information Agreement (GSOMIA) has already been signed in 2002.
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After the historic India visit of the US President Barack Obama in January this year, the Pentagon had submitted drafts of two other foundational agreements -- Communications and Information Security Memorandum of Agreement (CISMOA); and Logistics Support Agreement (LSA) - to the Indian Embassy here, which is now being reviewed by the Indian Government, officials said.
Officials said they have received requests for further queries from the Indian government on all of these agreements and there is no time line on the signing of these agreements.
"We are not putting any pressure on India. It's up to India to decide," one official said.
"These agreements represent a confluence of interests in safeguarding sensitive information and facilitating enhanced cooperation," officials said, adding that none of these agreements "infringe upon Indian sovereignty".
"Foreign governments are not obligated to procure communications equipment, products, data, or services solely from the US," he said.
They further said that these agreements "do not" provide the US with unapproved access to foreign territory or facilities; or to foreign military assets or IT systems.