 Complete the following phrase:  Prior to the negotiation of the Treaty of Versailles, Bullitt, along with journalist Lincoln Steffens and Swedish communist Karl Kilbom, undertook a special mission to Soviet Russia to negotiate diplomatic relations between the United States and the Bolshevik regime. It was authorized by Wilson advisor Edward M. House. On March 14, Bullitt received a Soviet proposal that demanded that the Allies agree to a peace summit on the Russian Civil War in which they had been participating. The proposed terms for discussion included the lifting of the Allied blockade on the country, the 