Question: Which comes first, the nations starting to come against Israel more aggressively or the reconstruction of the Temple?
Response: I don't think that either one of these two events depends upon or is related to the other. Nations have been aggressively trying to destroy Israel for thousands of years. That opposition has been fervently practiced in the UN for the past 60 years.
Antichrist will be the world ruler when the Temple is rebuilt, and it will have been by his approval. There will probably have been a false peace brokered before Antichrist takes over the entire world. As a result of this seeming approval of Israel by Antichrist, persecution will have eased briefly only to return with greater intensity as Satan realizes that his time is short.