Leaders of the North Atlantic Treaty Organization (NATO) countries are concerned about a potential Russian attack on one of them. Their apprehensions stem from doubts about the United States maintaining its traditional role in defending Europe as part of the Alliance, informs Bloomberg. The agency noted a growing concern among European allies of US President Joe Biden. They are aware that, at a time when Russia is emboldened by its successes on the battlefield in Ukraine, the US might reduce assistance to NATO countries. Additionally, leaders and governments of these countries have done too li…