The late Friday night arrest of Glas prompted Mexican President Andrés Manuel López Obrador to order the immediate suspension of diplomatic ties with Quito.
In a post on X, Obrador called the act a “flagrant violation of international law and the sovereignty of Mexico.”
The breach of diplomatic convention has sent shockwaves through the region, with Latin American leaders from across the political spectrum condemning the incident.
Under diplomatic norms, embassies are considered protected spaces.
It marks the culmination of a series of diplomatic provocations between Mexico and Ecuador this week.
Glas has since been transferred to a maximum-security prison in Guayaquil known as La Roca, Ecuadorean authorities said.
Glas served under leftist ex-President Rafael Correa between 2013 and 2017. He had most recently been accused by Ecuadorian authorities of embezzling government funds meant to help rebuild after a devastating 2016 earthquake.
Following his arrest, a host of Latin American countries – including regional giants Brazil and Argentina – rallied around Mexico to condemn Ecuador. Several pointed to a violation of the Vienna Convention on Diplomatic Relations, the international treaty that defines a framework for relations between countries.
Some also pointed to a breach of Glas’s right to asylum. Nicaragua has joined Mexico in severing diplomatic ties with Ecuador.
The right-wing Argentinian government called for “full observance of the provisions of that international instrument as well as the obligations arising from the Vienna Convention on Diplomatic Relations.”
Left-wing Colombian President Gustavo Petro said Glas’s right to asylum was “barbarically violated,” while Honduras President Xiomara Castro said the assault on the embassy “constitutes
United Nations Secretary-General António Guterres was “alarmed” by the raid, his spokesperson said.
Stéphane Dujarric, spokesperson for the Secretary-General, said Guterres reaffirmed “the cardinal principle of the inviolability of diplomatic and consular premises and personnel.”
Glas, 54, was arrested late Friday night. He has said he is the subject of political persecution and had been sheltering inside the embassy.
Video from the scene showed police officers massing around the embassy, some armed.
At a news conference Saturday, Ecuadorian Foreign Minister Gabriela Sommerfeld defended the raid, saying the action was taken “in the face of a real risk of imminent escape.”
Sommerfeld also accused Mexico of violating the principle of non-intervention by letting Glas stay in the embassy and evade an order to appear regularly before authorities in a corruption probe.
She dismissed Mexico’s claim that Glas was being politically prosecuted, saying: “For Ecuador, no criminal can be considered a politically persecuted person when he has been convicted with an enforceable sentence and with an arrest warrant issued by the judicial authorities.”