Residing or undertaking any economic activities in Manchuria or Xinjiang. Apparently, Stalin had in mind to insist on the exclusion of Americans in particulas from all parts of China, but eventually he settled for these bordering provinces, the effect of which was to limit any foreign economic influence there to the Soviet Union alone. The only precedents for this were the unequal treaties of the imperialist era. The Chinese leader had to swallow this bitter pill the day after they had, together with Stalin, repudiated Acheson’s accusations that Stalin had special designs on these territories. The pill was not sweetened by the inclusion of the Soviet Far East and Central Asia in the zones denied to third parties, as that ban was already in place. No protocol was kept secret for forty years. Mao’s bitterness was apparent when in 1958 he referred to these provinces as Soviet colonies.