Russian forces have seized 505 square kilometers since October offensive

Since Russia's most recent offensive operation began in October 2023, its forces have captured an area totaling 505 square kilometers, the Institute for the Study of War, a Washington-based think tank, said in its latest assessment.
The Institute for the Study of War said from January 1 to March 28, Russian forces expanded their territorial control by nearly an additional 100 square kilometers. "This marginal increase in the rate of Russian advance is not reflective of the threat of Russian operational success amid continued delays in US security assistance," according to the think-tank.
Material constraints hinder Ukrainian forces' ability to effectively carry out defensive operations, while simultaneously granting Russian forces the flexibility to pursue various strategies in their offensive maneuvers. This scenario, according to the Institute for the Study of War, presents potential for Russian forces to achieve significant operational gains in the future.
As material shortages endure and Ukraine wrestles with addressing manpower issues, the scope for exploiting Ukrainian vulnerabilities is expected to broaden.
"The arrival of sufficient and regular Western security assistance and the resolution of Ukrainian manpower challenges would narrow these opportunities for Russian forces," the Institute for the Study of War concludes. Ukraine is currently preventing Russian forces from making significant tactical gains along the entire frontline, but continued delays in US security assistance will likely expand the threat of Russian operational success. The continued degradation of Ukraine’s air defence umbrella provides one of the most immediate avenues through which Russian forces could generate non-linear operational impacts