[3]: 362–3 He represented the interim Canton government in China's delegation, headed by Lu Zhengxiang, at the Paris Peace Conference, 1919 after World War I.

[5]: 113  Notwithstanding their competitive positions domestically, Wang and Koo joined forces in staunchly promoting the formation of the League of Nations, jointly authoring a pamphlet on the subject.

As foreign minister, Wang negotiated a settlement with Japan over the Jinan Incident of 1928; with Soviet Russia over the Chinese Eastern Railway in Manchuria; treaties restoring Chinese territory in British Weihaiwei and French Tonkin; and tariff autonomy or commercial agreements with more than a dozen countries, including Japan.

[3]: 363 Wang was a keen athlete who fervently believed in sports as a vehicle for national development.

He represented China at the Far Eastern Championship Games in 1913[7]: 210  and was later to be the first Chinese member of the International Olympic Committee.