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.
US President Donald Trump denied on Friday that the United States has made major concessions to Iran and a senior US official called an emerging pact "performance-based" with Tehran getting no frozen assets until its part of the agreement is fulfilled.
Hopes grew on Friday for peace between Iran and the US after President Donald Trump said a deal could be signed as soon as this weekend, even as Tehran said it had not made a final decision on a pact.
Families of the 260 people killed when an Air India Boeing 787 crashed in Ahmedabad a year ago gathered on Friday for prayers and a candlelight tribute to mark the anniversary of the disaster.
Two Ebola-related deaths have been confirmed in a displacement camp in eastern Congo, the UN refugee agency said, with aid workers warning the risk of the disease spreading quickly in crowded refugee sites was high and worrying.
Ukraine and Russia exchanged overnight drone strikes into early Friday, with Ukraine targeting a major oil processing and petrochemical region while Russia attacked railway stations and electrical substations.
Authorities in Afghanistan's western city of Herat arrested at least 30 women, accusing them of violating dress rules imposed by the Taliban government, the UN agency for women's rights said, but added that some were later released.
US President Donald Trump called off plans for renewed military strikes on Iran at the last minute on Thursday, saying negotiations with Tehran had advanced to the highest levels of Iran's leadership and had been approved by a broad coalition of regional powers.
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