  This paper studies the global existence and uniqueness of strong solutions
and its large-time behavior for the compressible isothermal Euler equations
with a nonlocal dissipation. The system is rigorously derived from the kinetic
Cucker-Smale flocking equation with strong local alignment forces and
diffusions through the hydrodynamic limit based on the relative entropy
argument. In a perturbation framework, we establish the global existence of a
unique strong solution for the system under suitable smallness and regularity
assumptions on the initial data. We also provide the large-time behavior of
solutions showing the fluid density and the velocity converge to its averages
exponentially fast as time goes to infinity.
