Saudi Arabia has agreed to give up control of Belgium's largest mosque in a sign that it is trying to shed its reputation as a global exporter of an ultra-conservative brand of Islam.
Belgium leased the Grand Mosque to Riyadh in 1969, giving Saudi-backed imams access to a growing Muslim immigrant community in return for cheaper oil for its industry.
But it now wants to cut Riyadh's links with the mosque, near the European Union's headquarters in Brussels, over concerns that what it preaches breeds radicalism.
The mosque's leaders deny it espouses violence, but European governments have grown more wary since Islamist attacks that were planned in Brussels killed 130 people in Paris in 2015 and 32 in the Belgian capital in 2016.
Belgium's willingness to put its demands to oil-producing Saudi Arabia, a major investor and arms client, breaks with what EU diplomats describe as the reluctance of governments across Europe to risk disrupting commercial and security ties.
Riyadh's quick acceptance indicates a new readiness by the kingdom to promote a more moderate form of Islam - one of the more ambitious promises made by Crown Prince Mohammed bin Salman under plans to transform Saudi Arabia and reduce its reliance on oil.
The agreement last month coincides with a new Saudi initiative, not publicly announced but described to Reuters by Western officials, to end support for mosques and religious schools abroad blamed for spreading radical ideas.
The move towards religious moderation - and away from the extreme interpretation of Islam's Salafi branch that is espoused by modern jihadist groups - risks provoking a backlash at home and could leave a void that fundamentalists try to fill.
But Saudi Arabia's recent moves on religion are seen by Belgian diplomat Dirk Achten, who headed a government delegation to Riyadh in November, as a "window of opportunity".
"The Saudis are disposed to dialogue without taboos," he told Belgium's parliament last month after the mission was hastily put together after the assembly urged the government to break Saudi Arabia's 99-year, rent-free lease of the mosque.