On 6 January 2018, Yen criticized the PRC's unilateral decision to activate the north-bound airline of M503 Flight Route as unilaterally changing the status quo across the Taiwan Strait and severely impacting the peace and stability in the East Asian region.[14][15]
On 3 October 2018, MPFreddy Lim, former Director of the Amnesty International Taiwan, inquired in a hearing session of the Foreign and National Defense Committee in the Legislative Yuan for re-investigation on the Lieyu massacre files in the military archive to render an apology to the victims' families through the Vietnamese Representative Office,[18][19] but Minister Yen disagreed, claiming that troops followed the "SOP" of the Martial Law to execute the orders, and had been court-martialed. Later, the MND followed up to state that "It has been too difficult to identify the deceased due to the long time, hence (the case) can not be processed further". This served as the sole statement of the government of the Republic of China on the case since martial law was lifted in 1987.[20][21]
^Zho, Lala (10 January 2021). "為什麼一天到晚在傳國防部長嚴德發要下台?" [Why are there always rumors that Minister Yan is stepping down?] (in Chinese (Taiwan)). Taipei: CredereMedia. Retrieved 1 February 2022 – via Yahoo! News.
^Su, Yung-yao; Lee, Hsin-fang; Chin, Jonathan (20 February 2021). "Tsai changes up Cabinet". Taipei Times. Retrieved 20 February 2021.
^Zhang, Yifei (20 February 2021). "嚴德發「降轉」國安諮委? 黃創夏諷:當然是「升級」!過年要說好話..." [Was Yen "demoted" to NSC? Commentator Huang: It's the (Lunar) New Year, so we surely congratulate as a promotion...] (in Chinese (Taiwan)). Taipei: Newtalk News. Retrieved 1 February 2022.
^李欣芳; 施曉光 (6 January 2018). "中國新航路 國安會批衝擊東亞和平" [National Security Security Council criticizes China's new Flight Route as an attack impact on the East Asian Peace] (in Chinese (Taiwan)). Taipei: Liberty Times. Retrieved 28 December 2021.
^呂欣憓 (8 April 2015). "李蒨蓉登阿帕契 10星37顆花共20將校受懲" [Janet Lee boarded AH-64E; 20 high-rank officers receives administrative penalties] (in Chinese (Taiwan)). Taipei. Retrieved 28 December 2021.
^"【19屍20命】浯島文學首獎探討「三七事件」小金門的殺戮時代" [Top Prize of the Wudao Literacy Award for the Research on March 7 Incident,the Killing Era in Lesser Kinmen]. UP Media (in Chinese (Taiwan)). Kinmen. 23 November 2019. Retrieved 27 December 2021.
^Guan Ren-jian (7 March 2008). "國軍屠殺越南難民的三七事件" [ROC Army Massacre Vietnamese Refugees in March Incident] (in Chinese (Taiwan)). PChome News. Retrieved 27 December 2021.
^外交及國防委員會 (3 October 2018). "會議隨選" [Proceedings Broadcast of the Foreign and National Defense Committee of the Legislative Yuan, IVOD Network Multimedia Video System] (in Chinese (Taiwan)). Taipei: 立法院議事轉播IVOD網路多媒體隨選視訊系統. Retrieved 27 December 2021.
^林昶佐委員、嚴德發部長 (3 October 2018). "立法院公報第107卷第81期委員會紀錄立法院第9屆第6會期外交及國防委員會第3次全體委員會議紀錄" [Foreign and National Defense Committee Records No. 3, Legislative Yuan Gazette, Vol. 107, No. 81, Legislative Yuan Term 9, Session 6] (PDF) (in Chinese (Taiwan)). Taipei: 立法院公報第107卷第81期. Retrieved 27 December 2021.
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