Turkey to re-inforce military presence in northern Cyprus

Erdogan is an idiot.

Looking at the Ukrainian conflict, I cannot help but think that the days of colonialism/imperialism imbued with the law of the jungle have not completely disappeared from the earth. Breaking out of territorial disputes here and there (e.g., Armenia vs Azerbaijan, Greek vs. Turkey, and Turkey vs. Cyprus) after a long hiatus of peace and stability seems to me to be the repercussion that has been sparked by the Ukrainian war. 

What have great powers like the U.S. done in the past 77 years to prevent imperialism from fomenting itself again?