Not much going on diplomatically; Ribbentrop is excess baggage.
There is a story that to celebrate Ribbentrop’s 50th birthday, the German Foreign Office decided to throw him a party. In keeping with the macabre theme that sometimes attends 50th birthday parties (especially if you’re a Nazi), they decided to have a coffin and fill it with all the treaties Ribbentrop had executed as Foreign Minister. Much to their embarrassment, as they collected the treaties from the archives, they realized that with the exception of the Tripartite Pact, Germany had broken all of them.
IIRC quite a number of the plotters had a foreign office background, so Hitler seems to have regarded him with the same skepticism he now regards the General Staff.