The drug smuggling scandal Russia wants to wish away

An Argentine police officer shows a package of cocaine found on the premises of the Russian Embassy in Buenos Aires.

Moscow (CNN)A massive cross-border drug bust has become a major public relations nightmare for Russia's diplomatic service, turning a positive story of international police cooperation into a snowballing media scandal at home.

Last week, Argentine police announced the drug bust: The country's Gendarmería Nacional said police had discovered and seized 389 kilograms of cocaine -- more than 850 pounds -- on the grounds of the Russian Embassy in Buenos Aires in December 2016.
A police officer opens up a package of the seized cocaine on December 14, 2016.
A sting operation followed, with Argentine and Russian investigators replacing the drugs with flour and then fitting the bags with GPS tracking devices to monitor the shipment, and identify and apprehend the smugglers.
It seemed to have been a textbook example of cross-border cooperation, with Russian diplomats tipping off the Argentinians about the drugs, and the two countries working together to stop illicit drug traffic. Now it's a story the Russian government appears to want to wish away.
    In recent days, Russian media have begun raising uncomfortable questions for the Russian Foreign Ministry, questioning official explanations.
    The basic facts are not in doubt: Investigators said a former employee of the Russian Embassy in Argentina was among those arrested at his home in Russia. Maria Zakharova, the Russian Foreign Ministry spokeswoman, confirmed that a member of the "technical staff" of the embassy who had worked on a short-term contract had been involved, and that the drugs had been discovered on the premises of a school on the embassy grounds.