The US co-chair of the OSCE Minsk Group James Warlick said positive steps were made during the summit on Nagorno-Karabakh conflict in Saint Petersburg.

“Positive steps on Nagorno-Karabakh peace at today's summit in St. Petersburg including a joint statement. We must work towards a negotiated settlement,” he tweeted.

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.