My understanding is that the Antichrist(s) will declare themselves.
Not at first. Although it could be argued Obama had done so.
Besides Putin fits that far better than Obama at this point at least. A large percentage in and near Russia believe him to be the Antichrist. The bible indicates Russia (definitely not America). Russia is closely allied with Syria and Iran. Putin is most like the richest man in the world and getting far richer by the minute.
Time will tell I suppose.