Koval threw the ball 17.34 meters on his third attempt.
Malaysian Muhammad Ziyad Zolkefli, who showed the best result of 17.94 meters, was disqualified after the competition.
As a result, Koval received the gold instead of the silver. Another Ukrainian, Oleksandr Yarovyi, took the silver.
Ukraine's national Paralympic team has already won 66 medals - 15 golds, 32 silvers, and 19 bronzes.
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