Rarely have Maritime Self-Defense Force ships garnered this much attention.

On April 30, the Izumo helicopter carrier — one of Japan's two largest and arguably most controversial naval vessels — set off for a three-month deployment and this month it conducted two quadrilateral naval exercises over a two-week span — first in the South China Sea and then in the Indian Ocean.

On Tuesday, Prime Minister Shinzo Abe and U.S. President Donald Trump are scheduled to inspect the Kaga — the other vessel in the Izumo-class — in Yokosuka, Kanagawa Prefecture.