A man walks past a residential building damaged during a shelling in Severodonetsk, North-West of Luhansk, Ukraine on April 16. Russia’s war in Ukraine reached its 100th day on Friday.

June 3 (UPI) — Russia’s invasion of Ukraine reached its 100th day on Friday, with Moscow tightening its grip on the Donbas region as Ukrainian forces slow — and in some areas even stall — Kremlin advances.

In the important eastern hub city of Severodonetsk, which Russia has captured most of over weeks of bombing and destroying the city infrastructure, Ukrainian president Volodymyr Zelensky reported in his latest national address of “some success” in pushing back, preventing Moscow from overrunning the municipality.

“The situation there is the hardest now,” Zelensky said, according to The Guardian. “Just as in the cities and communities nearby — Lysychansk, Bakhmut and others. Many cities are facing a powerful Russian attack.”

In Lysychansk, one of two cities in eastern Ukraine that is at least partially under their control, Russian forces have destroyed roughly 60% of its infrastructure and residential buildings. Fleeing residents have dwindled the city’s population from 97,000 to about 20,000, Lysychansk military-civil administration head Oleksandr Zaika said.

Sloviansk, another key eastern city, has also faced intense Russian bombing this week as the city’s mayor called for residents to immediately evacuate. Officials confirmed the city is currently without electricity and water.