Below the oblasts come cities of oblast subordination and raiony. At the bottom we find rural and settlement soviets. We should note that certain very small cities will be subordinate to the raion level. In larger cities there will also be urban raiony. In the republics of Estonia, Latvia, Lithuania, Georgia, Armenia, Azerbaidzhan and Moldavia, there are no oblasts and thus the raiony and cities here will be subordinate to the Republic level.
Source: wiktionary