Estonia, Latvia and Lithuania cannot really trust Russia (the leader of the Commonwealth of Independent States) as Russia forcibly made those states part of the Soviet Union and and did allow for democracy there. That's why they don't want to be part of CIS. They can afford not to be due to their location in Europe, next to western Europe, so then can claim help from western Europe in case of Russian Invasion (unlike Kazakhstan for example).
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Agriculture yielded more food, which made denser human populations possible, thereby supporting city development. Farming led to dense, settled populations, and food surpluses that required storage and could facilitate trade. These conditions seem to be important prerequisites for city life. Many theorists hypothesize that agriculture preceded the development of cities and led to their growth.
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