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"The PABSEC General Assembly is to take place in Kyiv at the end of the year. An unprecedented incident happened when the Ukrainian side, the host country, did not invite Russia, a member country, to the session. It has never been before," he told TASS.

Read alsoUkraine boycotts PABSEC General Assembly in Moscow"The PABSEC is a rather complex organization. There are countries that have bilateral conflicts. However, it has never been before that a country, having an acute conflict with the other party, did not invite the delegation [of the latter] to a session." Emelyanov said.

"We drew the attention of our Serbian colleagues to this fact and asked them to support Russia's interests [at PABSEC] while we are absent," the Russian parliamentarian added.

As UNIAN reported earlier, the Ukrainian permanent delegation to the Parliamentary Assembly of the Black Sea Economic Cooperation refused to participate in the 47th PABSEC General Assembly held in Moscow on June 28-30, 2016.