A video appears to show a British-built Challenger 2 tank in Ukraine with an extra piece of armor added to protect a weak spot.
Ukraine's new tanks are seen in action as counteroffensive gets underway - The Japan Times
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British Challenger 2 tank destroyed in combat for first time, Ukraine footage shows, Ukraine
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UK is considering to supply Ukraine with British-made Challenger 2 tanks, Defense News January 2023 Global Security army industry, Defense Security global news industry army year 2023
Leopard 2 - Wikipedia