Zarif in the letter explained continuation of provocative and illegal approach of the US government by ruining the international deal.
Qasemi added that the letters were sent by a number of special envoys and Iran's ambassadors in other states.
Zarif has already held diplomatic consultations with officials across the world especially signatories to the nuclear deal.
3 weeks ago, Zarif sent separate letters to UN Chief António Guterres and EU foreign Policy Chief Federica Mogherini about the nuclear deal.
Earlier, The European Union's foreign policy chief Federica Mogherini was speaking to reporters upon her arrival at the Foreign Affairs Council in Brussels ahead of a meeting of the EU foreign ministers.
The European Union's foreign policy chief said that EU resolved to preserve the Joint Comprehensive Plan of Action (JCPOA) after US withdraw from the deal.
US President Donald Trump officially declared the exit of JCPOA on May 8, 2018
