From the Canadian Government:
(issued June 28 – still valid) OFFICIAL WARNING: Foreign Affairs and International Trade Canada advises against non-essential travel to Nagorno-Karabakh and the surrounding areas due to tensions resulting from the political situation and military presence. The border with Azerbaijan, including the Nakhichevan Autonomous Republic of Azerbaijan, is closed. A cease-fire has been in effect since May 1994. However, armed clashes and gunfire along a 5km buffer zone of the border and cease-fire line may occur sporadically. There are numerous landmines surrounding the conflict zones with Nagorno-Karabakh.
Read more – http://www.voyage.gc.ca/countries_pays/report_rapport-eng.asp?id=14000#2