Whether this speech was ever given by Stalin is still the subject of dispute by historians and no proof is as yet unanimously accepted. According to Viktor Suvorov's book M-Day, Soviet historians laid special emphasis on proving that no Politburo meeting took place on 19 August 1939. Nevertheless, Suvorov states in his book that Russian military historian Dmitri Volkogonov has found evidence that a meeting really took place on that day.