Rico Krieger, 30, was convicted under six articles of Belarus’s criminal code including “terrorism” and “mercenary activity” at a secretive trial held at the end of June, according to Belarusian rights group Viasna.

“Taking into account a request from the German Foreign Ministry, Belarus has proposed concrete solutions on the available options for developing the situation,” Belarusian Foreign Ministry spokesman Anatoly Glaz said.

“The foreign ministries of the two countries are holding consultations on this topic,” he added.

Few details have been published about the case.

Part of the court proceedings were held behind closed doors, the exact allegations against the man were not immediately clear and there has been little information in Belarusian state media about the trial.

According to a LinkedIn profile that Viasna said belonged to Krieger, he worked as a medic for the German Red Cross and had previously been employed as an armed security officer for the US embassy in Berlin.

A source at the German Foreign Ministry told AFP on Friday that it and the embassy in Minsk were “providing the person in question with consular services and are making intensive representations to the Belarusian authorities on his behalf.”

The source added that “the death penalty is a cruel and inhuman form of punishment that Germany rejects under all circumstances”.

Belarus is reported to have executed as many as 400 people since it gained independence from the Soviet Union in 1991, according to Amnesty International.

But executions of foreign citizens are rare.

The country is run as an authoritarian regime by long-time leader Alexander Lukashenko, who has detained thousands of dissidents and civic activists who oppose him.