sentences:  In May 1990, the New Armenian Army (NAA) was established, serving as a defence force separate from the Soviet Red Army.Clashes soon broke out between the NAA and Soviet Internal Security Forces (MVD) troops based in Yerevan when Armenians decided to commemorate the establishment of the 1918 First Republic of Armenia.The violence resulted in the deaths of five Armenians killed in a shootout with the MVD at the railway station.