Government and State are two different things. The State is an abstract concept and Government has a physical appearance. A State has four elements government, population, territory, and sovereignty. The State never acts itself, it is the Government which acts physically to run the political administration of the state. Government is actually an element of the state and so on and so forth.

http://www.preservearticles.com/2010...overnment.html

State is to be recognized by other states in the international world. On the event of the creation of a nation-state, other nation-states of the world recognize it as a diplomatic act depending upon their national interests. For example, Pakistan does not recognize Isreal as a nation-state. Recognition is of two types de-jure and de-facto. However, why a state needs recognition of itself from national law i.e. constitution which is made by nation-states themselves. In my personal opinion, a state doesn't need recognition from the national law because a state has the authority to make its own laws and statutes which make the constitutional law.

Recognition of Government can be done by nationals of that state or by other nation-states. For example, if a new government is formed in a nation-state through martial law or through illegal means and other nation states have the option of not recognizing it as a legal government. People of a nation state can revolt against a government and deny to recognize it if it is not a famous government.