In 1992, the countries of the former U.S.S.R. all suffered serious economic declines with the disruption of economic ties resulting from the breakup of the Soviet Union and its unified central planning system. All of the countries were in a period of difficult economic transition as they sought to develop new economic relations within their own countries, with the neighbouring countries of the former Soviet Union, and with the rest of the world. Based on resource endowments, the countries of the former Soviet Union can be divided into several groups. The Baltic states of Latvia, Lithuania and Estonia along with Moldova are all minor mineral producers and will be almost entirely dependent on other countries for mineral products. The countries of Armenia, Azerbaijan, Belarus, Kyrgyzstan, Tajikistan and Turkmenistan all have significant production of one or more mineral products that are important to their countries' economies, but they are still dependent on imports for most of their mineral requirements. On the other hand, Russia, Kazakhstan, Ukraine and Uzbekistan each have at least one, if not many, minerals for which they are the leading world producers. However, the economic viability of some of these mineral industries is still to be determined.