He was the High Commissioner (Ambassador) to the Court of St. James in London, England, and the Minister of Foreign Trade in the administration of Kwame Nkrumah before the military coup of 1966.

[3][4] While he was High Commissioner, Armah led a delegation of diplomats sent by Nkrumah to Vietnam in 1965 to establish ties to the government in Hanoi following the rejection of a Commonwealth Peace Mission proposed earlier that year.

[8] Home Secretary for the United Kingdom Roy Jenkins determined that the charges were brought by Ghana for political crimes, and thus chose to decline the extradition request under the Fugitive Offenders Act.

[11] Nkrumaist political parties were not permitted again until the establishment of the Third Republic of Ghana, allowed by Jerry Rawlings, who had led the Armed Forces Revolutionary Council (AFRC) in a June 1979 coup.

[12] He was placed in administrative detention once more in 1991 "in the interest of national security" after writing an article in the Ghanaian newspaper Christian Chronicle critical of the ruling PNDC.