Japan would acquire one RQ-4B Global Hawk

In the defense plan 2018 , Japan would acquire one RQ-4B Global Hawk UAV (Unmanned Aerial Vehicle) in order to enhance persistent wide-area surveillance capability and to ensure security of seas and airspace surrounding Japan.

Source: https://www.armyrecognition.com/december_2017_global_defense_security_news_industry/new_record_for_defense_budget_of_japan_with_$46_billion.html