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- Ukraine's ongoing counteroffensive is facing stiff Russian resistance and tough defensive fortifications.
- But the biggest threat to Kyiv's troops right now are minefields, the top US general said this week.
- Minefields are one of several Russian defensive lines and have been a tremendous challenge.
Ukraine's ongoing counteroffensive is moving slowly as its troops face formidable Russian defenses. The biggest of these hurdles for Kyiv's forces are sprawling minefields and not Russia's superior airpower capabilities, the top US general said this week.