Is this some sort of hotline that will be used in case of conflict (such as a nuclear strike by one party)? It appears that the US expects this adversary to beh

Is this some sort of hotline that will be used in case of conflict (such as a nuclear strike by one party)? It appears that the US expects this adversary to behave like their adversary of old, the Soviet Union. Such a hotline was established after the Cuban Missile Crisis of 1963.