In 1984, Chien brought Wang, then Section Chief of the Department of North American of the Ministry of Foreign Affairs, to his Representative Office to participate in the lobbying of the U.S. Congress for the interests of ROC.

The first quotation refers to the time when the ROC decided to accept the proposal of US President Ronald Reagan to provide a secret donation to Nicaragua rebels.

In August 1985, Foreign Minister Chu Fu-sung asked Wang to personally deliver an instruction to Chien, ROC Representative in Washington.

In the month of July, Vice President Lee Teng-hui's Secretary Su Chih-chien (蘇志誠) asked Wang to deliver a message from Taipei to Chien, who was very doubtful about its content.

In 1991, Ting promoted Wang, who took over Jason Yuan’s position, as Director-General of Congressional Affairs Division of ROC's representation in Washington D.C..

Thanks to the strategy devised by Ting, Wang brilliantly succeeded in a very short period of time in winning the support of a large number of both members of the U.S Senate and House for the sale of F-16 fighter planes to Taiwan.

The strong support and Congressional resolutions of U.S. Congress contributed to President Bush’s announcement of the sale 150 F-16 fighter planes to the Republic of China on September 2, 1992.

In March 1994, as Chief of Protocol of the ROC Ministry of Foreign Affairs, Wang accompanied President Lee Teng-hui(李登輝) in his first visit to Central American countries, and South Africa.

In October 1995, Wang was awarded the "Orden Antonio Jose de Irisarri en el grado Gran Oficial" medal by the President of Guatemala.

[6][7][8] On February 11, 2013, Pope Benedict XVI’s announced retirement shocked the world, as a similar event last occurred 600 years earlier.

Wang Yu-yuan, without previous authorization, through negotiations and exchanging of views with the Vatican, tried for nearly a month to succeed at what was regarded as an extremely difficult task: welcoming ROC President Ma Ying-jeou to attend Pope Francis’ installation ceremony.