 He worked with representatives of both Poland and Lithuania against a hostile Soviet Union, which they viewed as a rogue state.When the latter would not adhere to the Convention for the Control of the Trade in Arms and Ammunition, Comnen, Kazimierz Sosnkowski and Dovas Zaunius introduced their own opt-out objections to the Convention.Alongside Nicolae Titulescu, who took over his seat at the League of Nations, Comnen worked to convince the Entente that Greater Romania was respecting her ethnic minorities.