The liberation of Aleppo, the US presidential election and the accident with an underwater drone in the South China Sea prompted Senator John McCain to say that the US leadership has failed.

Axar.az reports citing to CNN, US Senate Armed Services Committee Chairman John McCain said that the recent world events, including the situation in Syrian Aleppo, alleged interference of Russia in the US presidential elections and the seizure of a US underwater drone in the international waters of South China Sea, all happened because the United States is losing its leadership in the world.

"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… We're starting to see the strains and the unraveling of it, and that is because of the absolute failure of American leadership," McCain told the CNN broadcaster in an interview.