Ulaanbaatar is the capital of which country?

Vientiane is the capital of which country? Beirut is the capital of which country? Kuala Lumpur is the capital of which country? Malé is the capital of which country? Naypyidaw is the capital of which country? Kathmandu is the capital of which country? Pyongyang is the capital of which country? Muscat is the capital of which country?