Zastoico competed only in two individual events at the 2000 Summer Olympics in Sydney. In his first event, 200 m butterfly, Zastoico placed fifty-ninth on the morning prelims. Three days later, in the 100 m butterfly, Zastoico challenged seven other swimmers in heat three, including Kyrgyzstan"s Konstantin Ushkov, silver medalist for Russia in Atlanta four years earlier, and Uzbekistan"s top favorite Ravil Nachaev.
He achieved FINA B-standards of 56.21 (100 m butterfly) and 2:05.12 (200 m butterfly) from the Russian Open Championships in Saint St. Petersburg. Swimming in heat one, he picked up a fourth seed by 5.72 seconds behind winner Tseng Cheng-hua of Chinese Taipei in 2:09.34. He rounded out a field to last place and fifty-ninth overall by more than three seconds behind winner Nachaev in 58.55.
He is a 2000 Olympian, and a member of the Moldova swimming team
