Why ruined Kostiantynivka is a crucial battleground for Ukraine and Russia

Kostiantynivka, a Donbas city that had 70,000 residents before the war and is now largely abandoned and in ruins, has become a fiercely contested battleground. Experts highlight its strategic importance for supply lines and logistics for both Ukraine and Russia. The so-called "grey zone" around the city is reshaping the rules of engagement in the area.