On 28 January Artsakh Republic President Bako Sahakyan and Prime-minister of the Republic of Armenia Nikol Pashinyan visited one of the military units of the Artsakh Republic Defense Army located in the north-western sector of the republic and participated in a solemn ceremony of handing over keys from a newly built dwelling house to the families of officers, Central Information Department of the Office of Artsakh Republic President stated.