evidence: Kazakhstan is a unitary republic with a bicameral legislature consisting of a Senate and an Assembly (Mazhilis). Working jointly, the two chambers have the authority to amend the constitution, approve the budget, ratify treaties, and declare war; each chamber also has exclusive powers. Legislators serve four-year terms. Two members of the Senate are elected from each oblast and major city by all legislative members of that administrative unit, with the exception of several appointed by the president. Ninety-eight members of the Assembly are elected from population-based constituencies by universal adult suffrage. [...] Kazakhstan possesses a small army, air force, and navy. During the Soviet period a vast nuclear arsenal was stationed in Kazakh territory. Kazakhstan ratified the Nuclear Non-Proliferation Treaty in 1993, however, and by 1995 it had dismantled or returned to Russia all of its inherited warheads. Since 1994 the country has been a full member of the Collective Security Treaty Organization (CSTO), a Russian-led military alliance closely associated with the Commonwealth of Independent States (CIS). [...] Housing, medical care, and other services are inadequate, despite large outlays by municipalities and the republic to keep up with the expanding population. Housing and other shortages exacerbate ethnic tension between Kazakhs, Russians, Uighurs, and other city dwellers, tensions that equitable distribution can partly alleviate.