Top officials from the United States and the EU met with their Russian counterparts for undisclosed emergency talks in Turkey designed to resolve the standoff over Nagorno-Karabakh, just days before Azerbaijan launched a military offensive last month to seize the breakaway territory from ethnic Armenian control.

The off-diary meeting marks a rare — if ultimately unsuccessful — contact between Moscow and the West on a major security concern, after Russian President Vladimir Putin’s invasion of Ukraine in February 2022 upended regular diplomacy.

A senior diplomat with knowledge of the discussions told POLITICO the meeting took place on September 17 in Istanbul as part of efforts to pressure Azerbaijan to end its nine-month blockade of the enclave and allow in humanitarian aid convoys from Armenia. According to the envoy, the meeting focused on “how to get the bloody trucks moving” and ensure supplies of food and fuel could reach its estimated 100,000 residents.

The U.S. was represented by Louis Bono, Washington’s senior adviser for Caucasus negotiations, while the EU dispatched Toivo Klaar, its representative for the region. Russia, meanwhile, sent Igor Khovaev, who serves as Putin’s special envoy on relations between Armenia and Azerbaijan.