The post cold war is being waged with invisible beamed weapons like those that cause the Havana Syndrome and are deployed in every city with a US presence. When it comes time to retaliate a simple hack will cause the users to be exposed to fatal levels of radiation by their own emmiters. All Russian embassies will be X rayed continually and Putin will be sub gamma rayed from orbit to avoid detection. Its the kind of war you set to simmer and wait until everyone is well done.