Short answers, pulled from the story.
The pact was concluded in Paris on the 2nd of May 1935. France ratified it in February 1936, and ratifications were exchanged in Moscow on the 27th of March 1936, the same day it entered into force. It was registered in the League of Nations Treaty Series on the 18th of April 1936.
Louis Barthou was the French foreign minister who actively pursued the alliance with the Soviet Union as a way to encircle Nazi Germany. He was assassinated in October 1934, before negotiations were finished. His successor, Pierre Laval, was sceptical of the alliance and only completed the arrangement under pressure from the French cabinet after Germany announced its rearmament in March 1935.
Laval ensured the treaty was compatible with the League of Nations Covenant and the Locarno Treaties. That meant military assistance could only be rendered after an allegation of unprovoked aggression was submitted to the League of Nations and after the UK, Italy, and Belgium all approved. Laval also refused to allow any military convention to be drafted, so France and the Soviet Union never agreed on how their forces would coordinate.
Hitler cited the French Parliament's ratification of the Franco-Soviet Pact as justification for remilitarising the Rhineland, claiming Germany felt threatened by it. Former British Prime Minister David Lloyd George defended this move in Parliament, arguing that Hitler would have been a traitor to Germany had he not responded.
The Czechoslovak-Soviet Treaty of Alliance was signed on the 16th of May 1935, just two weeks after the Franco-Soviet treaty. It followed directly from the Franco-Soviet agreement because Czechoslovakia was France's main ally, and the new Soviet-French relationship created the diplomatic foundation for a parallel Soviet-Czechoslovak arrangement.
By 1938, appeasement policies pursued by Chamberlain and Daladier ended collective security. Germany's Anschluss of Austria and the Munich Agreement, which led to the dismemberment of Czechoslovakia, proved the system could not hold. The Soviet Union then signed the Molotov-Ribbentrop Pact with Germany in late August 1939, decisively breaking with France and ending any remnant of the 1935 alliance's purpose.