In November 1956, an agreement was reached between the Swedish and Peruvian governments on the mutual elevation of the respective countries' legations to embassies.

The diplomatic rank was thereafter changed to ambassador instead of envoy extraordinary and minister plenipotentiary.

[4] In 1983, after Ambassador Cai Melin [sv] expressed support for Amnesty International during a private event in Peru—which had criticized the Peruvian regime in a letter for torture and arbitrary executions, including of Indigenous people during the Peruvian Civil War—he faced criticism from the Peruvian Ministry of Foreign Affairs.

The regime in Peru, under President Fernando Belaúnde, had been displeased with Amnesty's criticism.

Melin was recalled, even though he had not been officially declared persona non grata by the Peruvian government.