To the delight of the Nazi leaders, Katyn created strains in the Allied coalition, with General Sikorski’s Polish government-in-exile in London endorsing German calls for the International Red Cross to investigate the massacre and challenging the denial which the Soviet Information Bureau had issued. Stalin responded by breaking off diplomatic relations with the London Poles. But it did not break up the Allied coalition. Whatever their private misgivings, Churchill and Roosevelt blocked the involvement of the International Red Cross in the investigation of the massacre, at the same time as
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