who is regulatory authority for embassies ? is there own country or in which country they are ?

Answer 1

The foreign ministry of each country hires and fires ambassadors and diplomatic and consular staff that it sends abroad. (Some embassy offiicals may work for other ministries, or for the military, of their governments.)

There is a "regulatory authority" within each country that provides accreditation -- as well as driving licenses, vehicle registration, sales tax exemption cards, customs exemption papers and the like. In the USA this is the Protocol Office of the Department of State. In the UK it is the Conference and Protocol Department of the Foreign and Commonwealth Office.

If someone has a problem with a foreign mission -- nonpayment of rent, say, s/he can seek some help from the protocol office who will try to get the foreign embassy or diplomat to meet their obligations. Diplomats cannot be sued or prosecuted without their consent (actually, the consent of their ambassador; or in the case of the ambassador, his or her foreign minister). But they can be declared "persona non grata" and have to leave the country.

If you want to see the regulations promulgated by the Department of State for its embassies and consulates abroad, go to this site: http://foia.state.gov/ and click on "regulations" on the left margin. The Foreign Affairs Manual (FAM) contains the operative rules.

Answer 2

The authority for the embassies is the country of name. The Chinese embassies or consulates in the US are actually Chinese territory. It's the same for all countries regardless of which country the actual embassy or consulate is in. The country of residence will assist if needed, but has no authority on the premises except in extreme circumstances.

Answer 3

Each nation has it's own Department of State. This is the agency who is in charge of all embassies for that country. The President appoints ambassadors with approval of the Senate here in the United States.

Answer 4

Your English teacher should give her wages back.
In the US, the embassies are under control of the State Department. Embassy staff, grounds, buildings, operations are all under control of and are a part of the US.