After Kot's tour of duty as Poland's ambassador to the Soviet Union, until 1943 he served as Polish Minister of State in the Near East, where substantial Polish armed forces were stationed. From March 1943 Kot was the Polish exile government's Minister of Information. One of his most memorable acts in this capacity was the public disclosure, on 17 April that year, of the Katyn Massacre. In that communiqué, the Polish government asked for a Red Cross investigation. This was rejected by Stalin, who used the fact that the Germans had also requested such an investigation as "proof" of a Polish-German conspiracy, and turned it into a pretext for breaking off Polish-Soviet diplomatic relations. After Prime Minister Sikorski's death on 4 July 1943 at Gibraltar, President Władysław Raczkiewicz asked Stanisław Mikołajczyk, who had been acting Prime Minister in General Sikorski's absence, to form a government. Kot retained his post as Minister of Information in Mikolajczyk's cabinet until 1944.