Russia in its advancements on Saturday lost its main bastion in the northeastern region of Ukraine in a sudden collapse.

The fall of Izium in Kharkiv province comes as a major defeat to Moscow since its troops were faced back from the capital in March. Izium served as a logistics base since the inception of the attack in North on the adjacent Donbas region that comprised of Donetsk and Luhansk.

Video posted on social media showed Ukrainian troops driving past a tank bearing the Russian pro-war “Z” symbol in the city of Kupiansk – shortly after capturing the single railway hub that supplies Russia’s entire frontline across northeastern Ukraine.

That left thousands of Russian troops abruptly cut off from supplies across an entire stretch that has seen some of the most intense battles of the war.

A separate social media video showed the Ukrainian military at the entrance of Izium after Moscow abandoned the city.

Ukraine reports having recaptured dozens of its towns and villages.