This article examines the development of the strategies of interaction between the Ministry of Foreign Affairs of the Russian Empire and the Constitutional-Democratic faction during the period of the III State Duma (1907–1912). The desire of the diplomatic staff to cooperate with the deputies, including the oppositional ones, is especially evident during these years. Whereby, the article focuses not only on their interaction during the formal work of the lower chamber of parliament, but also on informal practices of cooperation, that had become an important channel of communication between the government officials and the public representatives. Thus, during these years public opinion begins to play a significant role in shaping the course of foreign policy of the Russian Empire.