The Bloomberg News quoted a Defense Department statement as saying that Qatari Defense Minister Khalid Al-Attiyah and his US counterpart, Jim Mattis, completed the $12 billion agreement on Wednesday in Washington.
"It is confusing, and the worst thing you want to do in a heated, delicate situation like this is to give mixed messages", Dr Paul Sullivan, a Middle East specialist at Georgetown University in Washington, said of the Pentagon announcement.
"America's relationship with Qatar is built on the foundation of bilateral security agreements and Qatar's strong role in facilitating United States military forward deployment in the Middle East".
In November, under the administration of former President Barack Obama, the United States approved a possible sale of up to 72 F-15QA aircraft to Qatar for $21.1 billion. "America's support for Qatar is deep-rooted and not easily influenced by political changes".
Two US warships arrived at Hamad port in Qatar on Wednesday as part of a planned joint military exercise involving marine forces, Qatar's state news agency said.
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"This is of course proof that U.S. institutions are with us but we have never doubted that", Reuters news agency quoted a Qatari official in Doha as saying. Qatar hosts the regional headquarters for U.S. Central Command, which includes a state-of-the-art air base the U.S. depends on to target "Islamic State".
The U.S Congress agreed a year ago to sell fighter jets to Qatar while the latest deal came after a recent Gulf crisis began between some Arab states and Qatar.
Qatar which is under diplomatic troubles in the Arabian peninsula with Saudi, UAE, Kuwait, Bahrain cutting their ties with the nation has signed a military pact with the U.S for USD12 Billion where it would be acquiring F-15 Fighter Jets.
The Turkish chief diplomat held talks with Qatar's emir and foreign minister on Wednesday and plans to visit Saudi Arabia. "We must lay these out in order to solve this problem".
Turkey is friendly to Qatar and has sent food supplies since the sanctions were imposed.