Web team has made some adjustments today.
New URLs for Leaderboards
US
https://us.diablo3.blizzard.com/rankings/
Asia
https://ap.diablo3.blizzard.com/rankings/
Europe
https://eu.diablo3.blizzard.com/rankings/
You can also adjust regions on the leaderboard on the top left as noted earlier in this thread. They were still testing things out throughout the day.
Likewise, they also brought back the region select to the profile page. Players will be able to self-select to view additional regional profiles outside of the one they are currently in.