 Four months after the treaty was signed, not one of the signatories had formally ratified it.Once it had decided to add itself to the signatories of the Paris antiwar accord, the government of the Soviet Union, whether for propaganda or practical purposes, became the Kellogg–Briand Pact's leading supporter, attempting to bring it into force with neighboring countries.On December 29, 1928, Litvinov proposed an additional protocol to the Paris treaty bringing it into immediate effect in the USSR's bilateral relations with historic enemy Poland and newly independent former part of the Russian Empire Lithuania.