Dajjal, the False Messiah(Masih ud Dajjal) would copy Essa Mesih(as) to gather ignorant Jews, Christians and Muslims(Most of whom are falsely waiting for Essa Masih to descend upon earth before Qiyamat), under his leadership, to cause bloodshed on earth, for a final battle before judgement day. The War of Armageddon. Dajjal would be from the Nations of Yajooj and Majuj.
The Nations of Yajujj and Majuj are current Permanent members of UN Security Council holding Veto vote. US, France(EU), Britain(UK), China, Russia.
This False Messiah may even be given special permission to perform Hajj as well.
Full fledge War between the US( and its Allies such as UK, Israel & Saudi Arabia) & China( and its Allies such as Russia).