Determine the valence intensity of the writer's mental state conveyed in the snippet "In a recent letter to The Times, Senator Daniel Patrick Moynihan of New York observed that secret protocols to the Molotov-Ribbentrop nonaggression pact in 1939 assigned Estonia and Latvia to the Soviet Union's ''sphere of influence'' and Lithuania to Nazi Germany's.". Provide a score from 0 to 1, where 1 signifies very positive and 0 signifies very negative.