The source, on Tuesday, confirmed that FM Zarif is expected to meet the civilian and military leadership during his day trip to Islamabad.
"So we think that this is normal behaviour between two states".
That comes as Yemen's Iranian-allied Houthi rebels have launched drone attacks on Saudi Arabia amid the heightened tensions.
Oman played a crucial role in bringing Iranian and USA negotiators together for preliminary talks that ultimately led to the 2015 Iran nuclear deal with major powers including the United States.
The Iranian foreign minister also met Speaker National Assembly Asad Qaider at the Parliament House following his meeting with the premier.
Together with France and the UK, Berlin has created a payment system which allows Iranian companies to trade overseas despite Mr Trump's attempts to bring the exports of Iranian oil to zero. Iran being the third largest oil exporter to India, after Saudi Arabia and Iraq, had reportedly traded 23.6 million tons of Iranian oil for fiscal year March 2019. Unlike many other news organizations, we have not put up a paywall.
Separately, Khamenei distanced himself from a landmark 2015 nuclear deal in his comments on Wednesday. Since then the United States and Iran had been embroiled in a tussle that has caused major regional instability.
Saudi energy minister recommends driving down oil inventories, says supply plentiful
Meanwhile, US President Donald Trump on Monday threatened Iran with "great force" if it attacked US interests in the Middle East . Iran said on Tuesday that it would resist USA pressure, declining further talks under current circumstances.
Two weeks ago, Iran notified the remaining signatories to the deal - China, France, Germany, Russia and the United Kingdom - that it would halt some commitments under the nuclear deal, a year after the United States unilaterally withdrew from the accord.
"Without exception we have responded with the message of the Iranian nation's strength, reason and resistance" in line with the policies of the Islamic republic, he added.
In the recent weeks, the United States deployed B-52 bombers and an aircraft carrier attack-group to the Gulf, as a result of alleged intimidation from Iran.
Khamenei said: "In some extent, I did not believe in the way that the nuclear deal was implemented".
Tensions between the United States and Iran have been surging since President Donald Trump canceled temporary waivers permitting countries, including Iraq, Turkey, Japan and China to purchase Iranian oil without violating US sanctions.
Iran's Foreign Minister Mohammad Javad Zarif arrived in neighboring Pakistan late Thursday for bilateral consultations amid Tehran's escalating tensions with the United States. In his interview to Fox News on Sunday, Trump appeared to favor a no-war rhetoric. We want to keep our journalism open and accessible and be able to keep providing you with news and analysis from the frontlines of Israel, the Middle East and the Jewish World. "Not only is it destroying the Joint Comprehensive Plan of Action on the Iranian nuclear program, but also can result in broader destabilization across the whole Middle Eastern Region".