"As the Russian side stated earlier, Russia will give an appropriate response," the ministry said.
Earlier, the Montenegrin Foreign Ministry announced that it was expelling six Russian diplomats.
"@MFA_MNE declared 6 diplomats of the Embassy of the Russian Federation accredited in Montenegro as personae non-gratae, due to activities that are contrary to the Vienna Convention on Diplomatic Relations and relations of mutual appreciation and respect between the two countries," the ministry said on Twitter.