Peace talks between Armenia, Nagorno Karabakh and Azerbaijan have been facilated  by  Organisation for Security and Cooperation in Europe since March 1992 within the frameworks of Minsk Group, co-Chaired by Russia, United States and France since mid-1990s.
Ceasefire agreement between Armenia, Nagorno Karabakh and Azerbaijan, facilitated by Russia's representative to the CSCE/OSCE Minsk Group Vladimir Kazimirov, was signed on May 5,1994, which had been maintained with only sporadic Violations along Line of Contact and international border till the latest Azerbaijani large scale offensive in the night of April 2,2016. (armenpress.am)
On the night of April 1-2, Azerbaijani armed forces initiated overt offensive operations in the southern, southeastern and northeastern directions of the line of contact with Nagorno Karabakh.

Continuing the escalations around Nagorno-Karabakh on the night of April 5, Azerbaijan’s armed forces used for the first time, since the signing of the 1994 ceasefire, a BM-30 Smerch rocket launcher in the southern direction of the frontline. (tert.am)
As many as 20 Karabakh servicemen were killed and 70 were wounded in the course of military operations. In addition, 4 civilians, one of them 12-year-old Vaghinak Grigoryan and 7 volunteers have been killed. Three elderly Armenians were brutally killed in Talish.
(http://hetq.am/eng/news/66976/azerbaijani-soldiers-execute-elderly-armenian-couple-in-artsakh-then-cut-off-their-ears.html).

26 Karabakh soldiers have gone missing so far.

Thanks to the Artsakh Republic Defense Army’s timely and professional actions, the situation is under control on the Nagorno Karabakh contact line, Armenian President Serzh Sargsyan said Monday, April 4.
Colonel Aroustamyan put the number of Azerbaijani military personnel killed at more than 300.
As of 10:00 p.m., April 5, the Azerbaijani side has lost 29 tanks and over 5 armored vehicles, including an IFV, as well as 1 TOS-1A Solntsepyok multiple rocket launcher, 1 BM-21 Grad multiple rocket launcher, 2 military helicopters and 7 unmanned aerial vehicles.

Seven Karabakh tanks have been neutralized so far.(PanARMENIAN.Net)
His Holiness Catholicos of the Great House of Cilicia Aram I held a second phone conversation with President of the Nagorno Karabakh Republic Bako Sahakyan and stated: "The entire Diaspora is recruited at Karabakh's side, and withunited spirit, will and faith is ready to assist Karabakh, in every sense."
As "Armenpress was informed by the Press Service of the Great House of Cilicia, during the conversation, President Bako Sahakyan gave broad information about the recent military operations and achievements. He greatly appreciated the Armenian Diaspora's strong support shown towards Karabakh.
His Holiness Aram I praised the courage and combat efficiency of our brave soldiers in Karabakh. (armenpress.am)