US Senator John McCain said that the Syrian conflict in addition to other issues around the world is the sign of a possible unraveling of the world order that was established after World War II. 
In an interview with (CNN) on the situation in Syria McCain said, "We're starting to see the strains and the unraveling of it, and that is because of the absolute failure of American leadership, when America doesn't lead, a lot of other bad people do" He further added, that the genocide situation happening in Syria is one of the largest in the century, and it is America's responsibility to be lead and defend it. 
McCain further stated on the Syrian government's slaughter of the citizens of Aleppo, that America has been "paralyzed" adding, "This is the sign of a possible unraveling of the world order that was established after World War II, which has made one of the most peaceful periods in the history of the world."

Source  QNA