That is not “very clear”, no. The Cold war did not end in another world war even though everybody built up their militaries. If the power distributions are about even, then most likely nations will stand around waving their missile dicks around until someone goes bankrupt or everybody collectively finds out that keeping that level of military on standby is fucking expensive and slowly powers down again.

You live in the most peaceful time in our species history (ignoring some flareups lately). The vast, vast majority of humanity lives in peace. Turn of the news and go touch some grass my dude.