"We tried to consider the fact hidden in the recital of the Initial chronicle of the first Kyiv princes, that can be confessed by beginning of the Russian state. We found that essence of this fact is such: approximately to the half of IX of century external and internal relations in the commercial and industrial world of the Russian cities were folded in such combination, by virtue of that the guard of borders of country and her foreign trade became their general interest subordinating to their prince to Kyiv and by doing Kyiv varangian principality grain of the Russian state. This fact it is necessary to attribute to the second half of IX of century : more precisely I do not decide to designate his time".