Asian and European leaders gathered Friday in Ulaan Baatar for a biennial summit to discuss challenges from terrorism and tensions in the South China Sea to the fallout from Britain's vote to leave the European Union.

The Asia-Europe Meeting, attended by leaders or high-level representatives of more than 50 countries and organizations, comes days after an international tribunal ruled that there are no legal grounds to China's claims to historic and economic rights in most of the South China Sea.

There will be close attention to what the leaders — including Chinese Premier Li Keqiang and German Chancellor Angela Merkel — say about the ruling.