The security service said it had documented the diplomat’s attempts to obtain sensitive information during informal meetings with Russian economic experts.
The talks are expected to focus on the potential resumption of initiatives concerning the safety of navigation in the Black Sea.
Russia’s Federal Security Service (FSB) said attacks in the region had become rarer and that it had defeated the Islamic insurgents in Dagestan.
Moscow’s Basmanny District Court ordered Ivanov to be kept in custody until June 23.
The FSB, however, admitted Mr Gershkovich had been accredited by its foreign ministry to work as a reporter in Yekaterinburg, Moscow,
Russia’s FSB is accusing Christo Grozev of helping Ukraine’s intelligence in his analysis of Russia’s warfare tactics and operations.
