Zimnikov finished first in the men's IT7 1500m run (4:33.78), Ukrinform reports.
France's Ollivier Boutier took a silver medal (4:34.99), and New Zealand's Dan Crawford won a bronze medal (4:36.01).
This is the first gold medal for Ukraine, which participates in the Invictus Games for the first time.
Earlier, Ukrainian Serhii Torchynskyy won a bronze medal in the men's IF4 shot put.
The competitions will last until September 30.
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