Boris III of Bulgaria
Hitler devoted most of his attention during the war to military and diplomatic affairs. He frequently met with foreign leaders, such as the January 10, 1943, he met with Romanian Premier Marshal Ion Antonescu at German field headquarters, with top-ranking generals on both sides. On 9 August 1943, Hitler summoned Tsar Boris III of Bulgaria to a stormy meeting at field headquarters, and demanded he declare war on Russia. The tsar refused, but did agree to declare war on far-away Britain. American news reports stated that Hitler tried to hit him and the tsar suffered a heart attack at the meeting; he died three weeks later.