RUSSIA The Russian Federation has a centralized political system, with power concentrated in a president and a prime minister, a weak multiparty political system dominated by the ruling United Russia party, and a bicameral legislature (Federal Assembly).USSIA arraignment within two months of a suspect's arrest, although a court may extend a criminal investigation for up to six months in cases classified as complex. With the personal approval of the prosecutor general, a judge may extend that period up to 18 months.