Qatar said it will leave OPEC next month, a rare example of the toxic politics of the Middle East rupturing a group that had held together for decades through war and sanctions.

Qatar, a member since 1961, is leaving to focus on its liquefied natural gas production, Energy Minister Saad Sherida Al-Kaabi told a news conference in Doha on Monday. He didn’t mention the political backdrop to the decision: dire relations with Saudi Arabia, which has led a blockade against his country since 2017; and a rhetorical onslaught from U.S. President Donald Trump against the cartel.

“The symbolism is profound,” said Helima Croft, commodities strategist at RBC Capital Markets LLC and a former analyst at the Central Intelligence Agency. “Given that the concentrating on LNG should not be incompatible with OPEC membership, the move will invariably lead many to conclude that the geopolitical divisions had become too intractable.”

A spokesman for the Organization of Petroleum Exporting Countries declined to comment, according to Bloomberg.

Qatar is OPEC’s 11th-biggest oil producer, accounting for less than 2 percent of total output, so its departure may not have a significant impact on discussions this week to cut production in conjunction with allies including Russia. Yet it sets a troubling precedent for a group that prides itself on putting shared economic interests above external politics.