In Twitter post, the ministry said:
FM @Urmaspaet: Estonia is extremely grateful to our friends and allies for supporting and calling for the release of Eston Kohver.— Estonian MFA (@valismin) September 15, 2014
Latvia and other countries have called for the speedy return of Kohver to Estonia after his appearance in a Moscow courtroom on espionage charges after his disappearance from the Estonia-Russia border on September 5.
Estonia has released classified documentation in an attempt to prove Kohver was snatched from sovereign Estonian territory while investigating cross-border crime and smuggling.
Russian authorities claim the agent was seized on Russian territory while engaged on a spying mission.
With the two sides showing little sign of reaching agreement, Russian ambassador to Estonia Yuri Merzljakov was summoned for a second time on Septmeber 12 and presented with a letter from Estonian Foreign Minister Urmas Paet to his Russian counterpart Sergei Lavrov.
"Taking an Estonian citizen to Russia against his will and detaining him in a Moscow prison is a clear violation of international law," Paet said int he letter.
"Eston Kohver must immediately be released so that he can return to Estonia," he added.