Iran is using the billions in cash resources provided under the landmark nuclear deal to engage in an unprecedented military buildup meant to transform the Islamic Republic's fighting force into an "offensive" juggernaut, according to a largely unreported announcement by Iranian military leaders that has sparked concern among U.S. national security insiders and sources on Capitol Hill.

Iranian officials announced late last month that Iran's defense budget had increased by 145 percent under President Hassan Rouhani and that the military is moving forward with a massive restructuring effort aimed at making it "a forward moving force," according to regional reports.

Iranian leaders have stated since the Iran deal was enacted that they are using the massive amounts of cash released under the agreement to fund the purchase of new military equipment and other armaments. Iran also has pursued multi-million dollar arms deals with Russia since economic sanctions were nixed as part of the deal.

Leading members of Congress and U.S. officials working on the Iran portfolio suspect that at least a portion of the Obama administration's $1.7 billion cash payment to Iran has been used to fund and support terrorists in the Middle East.

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