Generally idea of united Europe has to guarantee peace and stabilization on it territory. At what there is dispute in aspect of stated of this territory. It notices itself, that borders of Europe wasn’t definite; it treats this particularly it concerns eastern border, which was movable. Trying to show borders of Europe usually it calls itself three conceptions. First from cancellation oneself to empire of Charles Great. Ruler that created monarchy in conditions of threat expansion of Arabs. That notion came into being European also, which fighting knights with Arabias invasions on Pyrenean Peninsula were de! ned. Heirs of Great Charles, Ottons, divided own territory on four large regions: Italy, Germany, Gaul and Sclavinia. Eastern border came to river Elbe: with run of years Otton’s territory included Hungary, Czech Republic, Poland. Second conception was built on so-called eastern schisms from 16th July of 1054 year. Christian world divided (orthodox) and western (roman catholic onto eastern order, called also catholic). Line of division ran resource from Adriatic to Danube, existing in XX century called state Yugoslavia; on Balkans they be shaped then Slavic communities; Serbians as well as Bulgarians tied with Orthodox Church, Slovenians and Croats with Catholicism. Alongside with Christianization civilization border shi! ed beyond Danube reaching for Arctic borders of continent. In Catholic circle there were Hungarians, western Slavs (Czechs, Slovaks, poles), Balts, Estonians and Finns; meanwhile in circle of order orthodox church found themselves Romanians and eastern Slavs (Ukrainians, Byelorussian).2 Russian diplomatist Wasilij Tatiszew on beginning XVIII age advanced third conception, recognizing mountains and river Ural for eastern border of Europe; he showed, that one should Russia to Europe.