In this timeline WW3 a.k.a. War of the Worlds started in December 2016, by Iran and Azerbaijan declaring war on Armenia
this is the story
Sunday 11 December Azerbeidzjan and Iran declared war on Armenia in conquest of Syunik'. Iran warned Nato and Brics to not intervene. 12 December Declared Saudi-Arabia war on Iran and Azerbeidzjan. At 13 December Serbia declared war on Kosovo and Albania and said they'll help Armenia as quick as they can. 15 December Turkey leaved Nato, the first conversations between EU members to join the war, Armenia 50% occupied, including the capital at the siege of Yerevan.