CEVAP:

The functions of a diplomatic mission are representing the sending state in the receiving state, protecting in the receiving state the interests of the sending
state and of its nationals, within the limits permitted by international law, negotiating with the government of the receiving state, ascertaining by all lawful means conditions and developments in the receiving State, and reporting thereon to the government of the sending state and promoting friendly relations between the sending state and
the receiving state, and developing their economic, cultural and scientific relations.