I want to know the answer to the following question:
Which Foreign Minister proposed that the Soviets should join this agreement of axis powers?
All the background I'm provided with is that "After Germany entered a Tripartite Pact with Japan and Italy, Ribbentrop wrote to Stalin, inviting Molotov to Berlin for negotiations aimed to create a 'continental bloc' of Germany, Italy, Japan and the USSR that would oppose Britain and the USA.". Is that enough to answer the question?