When asked whether the United States would target Russian Federation and China with sanctions if they refuse to reimpose the U.N. measures on Iran, Pompeo said: "Absolutely".
Iran can once again purchase tanks and fighter jets after the expiry of a United Nations arms embargo on Sunday.
The Islamic Republic will not, however, immediately begin a spending spree, according to a statement from he Iranian foreign ministry on Sunday.
The embargo on the sale of conventional arms to Iran was due to start expiring progressively from today, October 18, under the terms of the United Nations resolution that blessed the 2015 nuclear deal between the Islamic republic and world powers. Iran's Foreign Ministry has declared it as victory of "multilateralism, peace and security", despite Washington's pressure to reimpose sanctions.
Zarif's comments were accompanied by a statement by the Foreign Ministry, which said that "as of today, the Islamic Republic of Iran may procure any necessary arms and equipment from any source without any legal restrictions and exclusively based on its defensive needs".
However, the foreign ministers of France, Germany and the United Kingdom, together known as the E3, wrote a joint statement in July, saying that while E3 will remain committed to fully implement Resolution 2231 of the nuclear deal, they believe lifting of the arms embargo "would have major implications for regional security and stability".
Tensions between Tehran and Washington soared after US President Donald Trump unilaterally withdrew from the nuclear deal in 2018, culminating in January when the US assassinated Iran's top general Qassim Soleimani in a Baghdad drone strike.
Iran rules out any arms buying spree as it expects UN embargo expected to end
Despite pulling out of the deal, the Trump administration insists it is still a "participant" and can therefore go ahead with reimposing sanctions.
In August this year, the Trump administration triggered a process aimed at restoring all UN sanctions, after the UN Security Council rejected a US bid to extend the conventional arms embargo on the country.
Calling this "a momentous day for the global community", Zarif said the world has defied "malign USA efforts" to protect the Security Council resolution and the nuclear deal.
The statement added that in the case of measures amounting to a "material breach of the resolution and the purposes" of the deal, Iran "reserves the right to take any necessary countermeasures to secure its national interests".
Authorities have said Iran will be ready to sell arms when the embargo ends.
"Today is a momentous day for the worldwide community, which in defiance of the USA regime's efforts, has protected UN Security Council Resolution 2231 and the Joint Comprehensive Plan of Action (JCPOA)", it added, referring to the landmark nuclear deal Tehran signed with world powers.