". The Treaty of Federation signed on 31 March 1992 stipulated that the republics were "sovereign states" that had expanded rights over natural resources, external trade, and internal budgets. The signing of bilateral treaties with the republics would grant them additional powers, however, the amount of autonomy given differed by republic and was mainly based on their economic wealth rather than ethnic composition. Yakutia, for example, was granted more control over its resources, being able to keep most of its revenue and sell and receive its profits independently due to its vast diamond deposits. North Ossetia on the other hand, a poorer republic, was mainly granted more control over defense and internal security due to its location in the restive North Caucasus. Tatarstan and Bashkortostan had the authority to establish their own foreign relations and conduct agreements with foreign governments. This has led to criticism from oblasts and krais. After the 1993 Russian constitutional crisis, the current constitution was adopted but the republics were no longer classified as "sovereign states" and all subjects of the federation were declared equal, though maintaining the validity of the bilateral agreements.