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Russian troop build-up threatens city seen as key to seizing Ukraine's Donbas
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Russian troop build-up threatens city seen as key to seizing Ukraine's Donbas

BBC News · Jun 21, 2026, 11:57 PM · Also reported by 3 other sources

Key takeaways

  • The entire city is now effectively in a "grey zone", no longer controlled by anyone, Ukrainian soldiers have told the BBC.
  • "They get into areas behind our backs and in urban conditions it's extremely difficult to push them out," says a Ukrainian drone pilot who operates in that area and prefers to remain anonymous.
  • Kostyantynivka is a gateway to the rest of the Donbas region.

Why this matters: a developing story that could shape the day's news cycle.

Abdujalil Abdurasulov In Kyiv Reuters Ukraine's commanders say the situation in Kostyantynivka is still under control, but accept Russian troops are active in the city Russian troops have infiltrated the strategic city of Kostyantynivka in eastern Ukraine and are now trying to surround it.

The entire city is now effectively in a "grey zone", no longer controlled by anyone, Ukrainian soldiers have told the BBC.

"They get into areas behind our backs and in urban conditions it's extremely difficult to push them out," says a Ukrainian drone pilot who operates in that area and prefers to remain anonymous.

Article preview — originally published by BBC News. Full story at the source.
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