The battle for the eastern Ukrainian city of Bakhmut has been the longest and bloodiest of this war so far.

Western officials estimate between 20,000 and 30,000 Russian troops have been killed or wounded here, while Ukraine's military has also paid a heavy price - and it still isn't over.

Russia has been trying to capture Bakhmut for months, and it's been a testament - so far - to Ukraine's determination not to give ground.

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