In the winter of 1940–41, Ribbentrop strongly pressured the Kingdom of Yugoslavia to sign the Tripartite Pact, despite advice from the German Legation in Belgrade that such an action would probably lead to the overthrow of Crown Prince Paul, the Yugoslav Regent. Ribbentrop's intention was to gain transit rights through the country that would allow the Germans to invade Greece. On 25 March 1941, Yugoslavia reluctantly signed the Tripartite Pact; the next day the Yugoslav military overthrew Prince Paul in a bloodless coup. When Hitler ordered the invasion of Yugoslavia, Ribbentrop was opposed, because he thought the Foreign Office was likely to be excluded from ruling occupied Yugoslavia. As Hitler was displeased with Ribbentrop over his opposition to the invasion, the minister took to his bed for the next couple of days. When Ribbentrop recovered, he sought a chance to increase his agency's influence by giving Croatia independence. Ribbentrop chose the Ustaša to rule Croatia. He had Edmund Veesenmayer successfully conclude talks in April 1941 with General Slavko Kvaternik of the Ustaša on having his party rule Croatia after the German invasion. Reflecting his displeasure with the German Legation in Belgrade, which had advised against pushing Yugoslavia to sign the Tripartite Pact, Ribbentrop refused to have the German Legation withdrawn in advance before Germany bombed Belgrade on 6 April 1941. The staff was left to survive the fire-bombing as best it could.