On the first day of Russia's large-scale invasion of Ukraine, Serhii Vasyliev volunteered to go to the military enlistment office and joined the Armed Forces of Ukraine. He understood that he needed to defend his homeland, his home, his family, and his four children who remained at home. He destroyed the enemy in Mykolaiv, Dnipro and Donetsk directions. https://univd.edu.ua/uk/news/16928