Subjects of the relations in the international private law are, first of all, natural and legal entities, sometimes - the states. Specifics of the relations is existence of "a foreign element". Understand as "a foreign element":
First, it is internationalization of economic life. Objective process of internationalization of the modern world economy demands also the new level of the multilateral economic relations. The characteristic example in this plan gives development of the European continent. Direct manifestation of internationalization of economic life is broad development of versatile economic and scientific and technical cooperation. If at a turn of XIX and XX centuries it was limited only to trade, at a turn of XX and XXI centuries is not only the exchange of goods and services, this industrial cooperation including joint ventures, coproduction, specialization and licensing is wide scale of scientific and technical cooperation, carrying out joint researches and development.