Japan is working on assembling a Marines-like unit within its Self-Defense Forces, amid concerns over Chinese claims of the Japan-administered Senkaku Islands in the East China Sea. Both countries have scrambled fighter jets over the uninhabited islands during the past two years, and low-level maritime standoffs have increased in nearby waters.

A recent Japanese media report said the Defense Ministry will buy the Amphibious Assault Vehicle, or AAV-7, which also is used by the U.S. Marine Corps. The ministry spokesman, however, denied any decision on a model had been made.

“We have purchased four AAV-7s in fiscal 2013 and two AAV-7s in fiscal 2014 as samples for reference,” the ministry spokesman said on condition of anonymity, as is customary in Japan.

The Defense Ministry began studying procurement options in April but hasn’t set a deadline for the study’s completion, according to the spokesman.

Japan trains regularly with the U.S. military on amphibious warfare, including during an expeditionary combat simulation at the bilateral Keen Sword exercise in November. Last year, Japanese troops traveled to California to train with Marines on reclaiming an island as part of the Iron Fist exercise.

The Marine Corps is focused on upgrading its aging AAV-7 stock and adding a new vehicle to take over its role.

Marine Commandant Gen. James Amos favors the Amphibious Combat Vehicle, though that program has faced budgetary pressures in Congress and design concerns from military analysts.

The wheeled Amphibious Combat Vehicle would provide greater protection on land, but would have limited “swim” capability and require a vessel or heavy-lift air transport to get it from sea to shore.