"Are you sure you do not have anything else to worry about? Observe the Vienna Convention and do not interfere in the internal affairs of sovereign states,” the ministry said in a Twitter comment addressed to the embassy and the German Foreign Ministry.
The embassy earlier commented in its Twitter blog on the preparations for the regional elections in Russia, noting that "the authorities have prevented many opposition figures from taking part in them."
The diplomatic mission stated that it was "extremely concerned" about the situation.