"Al-Quds (Jerusalem [in Arabic]) is neither America's to give away nor Israel's to take. And NOT for brutal accomplices to try to buy. Quds belongs to Palestine & Palestinians: history shows that whomever ignores this is condemned to ignominious failure. Iran stands with Palestine. #QudsDay", Zarif tweeted.
Quds Day is an annual celebration that was launched by Iraq in 1979 as an expression of solidarity with the Palestinians. This days falls on the last Friday of Ramadan, which this year is 31 May.
The statement comes as the United States is going to unveil its highly-anticipated Middle East peace plan in the coming weeks. The US-led conference in Manama in June, aimed to focus on economic incentives for Palestine Authority's development, is widely expected to mark the release of the economic part of the plan.
The situation worsened in May 2018 after the United States decided to relocate its embassy in Israel from Tel Aviv to Jerusalem, provoking a huge backlash in Palestine, the Arab world and many US allies, including the EU opposing any unilateral moves with regard to the holy city's status.
The Palestinian Authority remains only partially recognised as a state and claims the territories of the Gaza Strip and the West Bank, including East Jerusalem. In 1947, the United Nations worked out a plan to put an end to the conflict, giving most of the West Bank and Gaza to Palestinians.
Israel occupied the territories 20 years later but claims to have withdrawn all its forces from Gaza in 2005, but the United Nations still considers some of the Palestinian territories to be occupied by Israel.