KYIV, Ukraine—Olympic champion gymnast Oleg Verniaiev is set to miss the Tokyo Games because he has been banned for four years following a failed drug test. The Ukrainian gymnast tested positive for the banned substance meldonium in August 2020 and was banned after a ruling by the Gymnastics Ethics Foundation, which hears disciplinary cases in the sport. The ban is backdated to run from November 2020 and could also rule him out of the 2024 Paris Olympics. Verniaiev was also ordered to pay nearly 5,600 euros ($6,600) in costs, the GEF said in its statement Tuesday. Verniaiev denies wrongdoing and said he will appeal the ruling to the Court of Arbitration for Sport. “The main question is how a banned substance got into my body?” he wrote in an Instagram post Tuesday. “Why did it happen at a time when there were no serious international competitions and there was only …