Russian troops have conducted military exercises in Moldova's pro-Russia separatist region.

Russian news agencies on Thursday quoted an army representative saying that 400 troops and 30 pieces of weaponry were involved in drills in Trans-Dniester, a narrow strip of land squeezed between Moldova and Ukraine.

Predominantly ethnic Russian Trans-Dniester broke away from Moldova in 1990 over fears that Moldova planned to reunite with Romania. Russian troops have been stationed in Trans-Dniester since a 1992 war which killed more than 1,500 people.

Army spokesman Oleg Kochetkov said that troops used 100,000 rounds of ammunition during the drills that involved armored personnel vehicles and grenade launchers.

Moldova's fears of Russian presence in Trans-Dniester intensified after Russia annexed Ukraine's Crimea last year and supported a separatist movement in eastern Ukraine.