The US was not invited to a meeting held Tuesday in Moscow between Turkish, Russian, and Iranian officials aimed at solving the crisis in Syria — and it’s not the first time Washington has been left out in the cold.

The US was also shut out of negotiations between Russian officials and Syrian rebel factions hosted by Turkish officials in Ankara earlier this month. Those talks ultimately led to a fragile cease-fire and evacuation deal in Syria’s largest city, Aleppo, where fighting intensified in recent weeks.

Though the two countries are on opposite sides of the war in Syria — with Turkey supporting the opposition and Russia supporting Syrian President Bashar Assad — Turkish officials reportedly signed a Russian proposal to end the conflict, titled the “Moscow Declaration,” during their meeting in the Russian capital on Tuesday.