"Given Russia's increasingly aggressive role in Europe, we are watching Russia's actions in Transnistria and the broader situation there very closely," Miller said at a press briefing, using the Moldovan name for the region.

"The United States firmly supports Moldova's sovereignty and territorial integrity within its internationally recognized borders, and we continue to encourage Chisinau and Tiraspol to work together and identify solutions to pressing concerns of communities on both sides of the Nistru (river)."

(Reporting by Humeyra Pamuk and Simon Lewis)