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

AI Summary

Russian troop build-up near Kostyantynivka poses a significant threat to Ukraine's control over the Donbas region. The potential fall of this key city could allow Russian forces to advance further into eastern Ukraine, intensifying the conflict.

If Kostyantynivka falls, Russian forces would be able push towards Ukraine's last remaining strongholds in the east.