The Russian Federation is a Presidential (or a constitutional) republic. The President is the head of the state and is elected directly by the people. In fact he has much power, he controls all the three branches of power. The President can even dissolve the Duma if he doesn't agree with his suggestions three times running. The President has his administration, but it's not part of the Federal Government. The President is involved in the work of the legislative and executive branches.
The Federal Assembly represents the Legislative branch of power. It's made up of the two houses: the Federation Counsil and the State Duma, which make laws. The Federal Assembly is also calld the Parlamrnt, but it's not its oficial name. Both chambers are headed by chairmen sometimes called speakers. The Duma consists of 450 deputies (one half is elected personally py the population, and the other half consists of the deputies who are appointed by their parties after voting). The members of the Federation Counsil are elected on a different basis. There are two representatives of each subject of the RF (89 subjects). Every law to be adapted must be approved by the State Duma, the Counsil of Federation and signed by the President. The President can veto laws passed by the Federal Assembly, but it can pass laws over the President's veto a two-thirds majority.
The Federal Government represents the executive branch of power. The President appoints its head, the Chainman of the Government, but the Dums must approve his appointment.
The juridical branch of power consists of the Constitutional Court, the Supreme Court and lower Courts. The responsibility of the Constitutional Court is to analyse the new laws to make sure they correspond to the laws of the state. The Constitutional Court has tte right to declare actions of the President, the Federal Assembly and the Federal Government unconstitutional. The Supreme Court is the higest instance for civil and criminal cases.