pretty sure they are capable of rebuilding it. I think their government just never bothered too

tbf werent they forced into entering the union far after america got its indepedence

not defending them, the muslim conquest were worse than the crusades, but dude they lasted much longer and happened way more frequently. Especially because after the ummayad caliphate felt they werent a organized force.

they are harmless, for now. Without a unified state they arent shit.

how did nato steal Ukraine? Ukraine pretty explicitly sided with Nato by self will, who did that because russia supported the donbas separatist groups.