Although a small country, Moldova has been of interest to U.S. policymakers due to its position between NATO and EU member Romania and strategic Ukraine. In addition, some experts have expressed concern about alleged Russian efforts to extend its hegemony over Moldova through various methods, including a troop presence, manipulation of Moldova's relationship with its breakaway Transnistria region, and energy supplies and other trading links. Moldova's political and economic weakness has made it a source of organized criminal activity of concern to U.S.