2022年2月，俄烏戰爭爆發。當時許多外國人為幫助烏克蘭對抗俄羅斯，紛紛志願參戰。其中約有10名來自台灣的志願者加入戰局。11月2日，來自花蓮的曾聖光在烏東盧甘斯克州因為躲戰壕被砲彈擊中後腦勺，當場陣亡，成為首位為烏克蘭參戰陣亡的台灣人。

11月14日，烏克蘭當局在西部利沃夫的聖彼德與聖保羅教堂（Church of the Most Holy Apostles Peter and Paul）為他舉行隆重的告別儀式，並為他覆蓋烏克蘭國旗。曾聖光的媽媽、姊姊與遺孀均在現場，現場也有近百位市民前來弔唁。

目前在烏克蘭的獨立廣場插滿許多國旗及陣亡軍人的照片，這些人來自世界各地，包括美國、英國、波蘭與白俄羅斯等國家。曾聖光的照片在最前方顯著位置，旁邊放著他的同袍照片，其中包括一名來自日本的志願軍，該日本志願軍在曾聖光陣亡不久後也戰死沙場。

In February 2022, the Russia-Ukraine war broke out. Many foreigners volunteered to help Ukraine fight against Russia, including about 10 individuals from Taiwan. On November 2, Tseng Sheng-Guang from Hualien was killed in action in Luhansk Oblast, eastern Ukraine. He was hiding in a trench when a shell hit the back of his head, making him the first Taiwanese to die fighting for Ukraine.

On November 14, Ukrainian authorities held a solemn farewell ceremony for him at the Church of the Most Holy Apostles Peter and Paul in Lviv, western Ukraine. Tseng Sheng-Guang was honored with a Ukrainian flag draped over his body. His mother, sister, and widow were present at the ceremony, along with nearly a hundred citizens who came to pay their respects.

Currently, Independence Square in Ukraine is filled with numerous flags and photos of fallen soldiers from around the world, including the United States, the United Kingdom, Poland, and Belarus. Tseng Sheng-Guang's photo is prominently displayed at the front, next to photos of his comrades, including a Japanese volunteer soldier who was killed in action shortly after Tseng Sheng-Guang's death.