The OSCE Minsk Group's US Co-chair James Warlick has called for a negotiated settlement of the Nagorno-Karabakh conflict.

"After many recent casualties, it's time for conflict to stop and work for a negotiated settlement," Warlick tweeted Apr. 8.

He added that it is time for peace in the Nagorno-Karabakh conflict.

The remarks come after the recent escalation of tension along the line of contact between the troops of Armenia and Azerbaijan.

On the night of April 2, 2016, all the frontier positions of Azerbaijan were subjected to heavy fire from the Armenian side, which used large-caliber weapons, mortars and grenade launchers. The armed clashes resulted in deaths and injuries among the Azerbaijani population. Azerbaijan responded with a counter-attack, which led to liberation of several strategic heights and settlements.

Military operations were stopped on the line of contact between Azerbaijani and Armenian armies on Apr. 5 at 12:00 (UTC/GMT + 4 hours) with the consent of the sides, Azerbaijan's Defense Ministry earlier said. Ignoring the agreement, the Armenian side again started violating the ceasefire.

The conflict between the two South Caucasus countries began in 1988 when Armenia made territorial claims against Azerbaijan. As a result of the ensuing war, in 1992 Armenian armed forces occupied 20 percent of Azerbaijan, including the Nagorno-Karabakh region and seven surrounding districts.

The 1994 ceasefire agreement was followed by peace negotiations. Armenia has not yet implemented four UN Security Council resolutions on withdrawal of its armed forces from the Nagorno-Karabakh and the surrounding districts.