There are no diplomatic relations between Armenia and Azerbaijan, largely due to the ongoing Nagorno-Karabakh conflict. The neighboring nations had formal governmental relations between 1918 and 1921, during their brief independence from the collapsed Russian Empire, as the First Republic of Armenia and the Democratic Republic of Azerbaijan; these relations existed from the period after the Russian Revolution until they were occupied and annexed by the Soviet Union. Due to the two wars waged by the countries in the past century—one from 1918 to 1921 and another from 1988 to 1994—the two have had strained relations. In the wake of ongoing hostilities, social memory of Soviet-era cohabitation is widely repressed (censored and stigmatised).