Molotov%E2%80%93Ribbentrop Pact:

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. Stalin sent Molotov to Berlin to negotiate the terms for the Soviet Union to join the Axis and potentially enjoy the spoils of the pact. After negotiations during November 1940 on where to extend the USSR's sphere of influence, Hitler broke off talks and continued planning for the eventual attempts to invade the Soviet Union.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What countries agreed to a tripartisan agreement?
Germany entered a Tripartite Pact with Japan and Italy