Peru's President Dina Boluarte announced the return of the country's ambassador in Mexico in response to comments from her Mexican counterpart branding her government as unconstitutional.
Boluarte said the remarks made earlier on Friday by Mexican President Andres Manuel Lopez Obrador about her administration go against the international right to non-interference.
Mexico's Foreign Ministry did not immediately reply to a request for comment.
Boluarte ascended to the South American country's presidency on December 7 after former President Pedro Castillo was impeached following an attempt to dissolve Congress.
Boluarte accused Lopez Obrador of backing Castillo's attempt at a "coup d'etat."
"With his statements, Mr Lopez violates the principle of international law about non-interference in internal affairs, as well as those referring to the defence and promotion of democracy," she said in a television address.
Lopez Obrador told a news conference on Friday that Mexico will keep supporting Castillo, as he was "illegally ousted."
Boluarte's remarks come after a meeting between Lopez Obrador and Castillo's wife, Lilia Paredes, in Mexico earlier this week.
British police were questioning five men on Monday on suspicion of explosives and terrorism offences after they were detained near an air base that has been used by the US to strike Iran.
Thousands sheltered on Monday in evacuation centres in the Thai capital, parts of it still flooded after havoc brought by intense weekend rain, while swelling reservoirs in an eastern province triggered orders for more to leave their homes.
Heavy rain and storms have triggered floods and landslides that killed 56 people in India, while in Nepal, 14 have died and another 11 are missing, with authorities warning on Sunday that more flash floods are possible.
The death toll from an Indonesian ship that capsized earlier this month rose to 66 as of Monday, as divers braved leaking fuel and dangerously unsound structures to find the 69 passengers still missing on the 16th day of the search.
The number of confirmed Ebola cases in the Democratic Republic of Congo has risen above 8,000 for the first time in the Central African country's ongoing outbreak, government data showed on Monday.