Kharkiv, Ukraine
the atmosphere is perfect for any Russo-Ukrainian war milsim. The large city is perfect for practically anything, armored combat, infantry combat, and so much more.
There's also military base inside the town, and a large airstrip just outside the town as well, perfect for your needs, with 4 hangars, and 4 helipads.
Bodies and destroyed vehicles are littered around for a perfect violent and gritty war experience.
Outside the city, there are forested regions with towns, villages, and farms perfect for ambushes and civilians. There is also a decent sized military base outside as well, perfect for your attacking forces to spawn at. This map is perfect for rural and urban combat alike.