Japan's largest warship to visit Subic in June

Duterte has also spoken about boarding a Chinese ship that he said will visit Philippine shores. This is after a US aircraft carrier visited the country earlier in the month, which he did not tour. 

Both the Philippines and Japan have maritime disputes with China. 

On Monday, Japan's State Minister for Defense Kenji Wakamiya led the formal turnover of two TC-90 patrol planes to the Philippine Navy in a bid to boost its maritime surveillance capability. 

Wakamiya said the Philippines is an important nation for Japan and celebrated the "great friendship" between Duterte and Japanese Prime Minister Shinzo Abe.

"The Philippines is a politically important nation for Japan as it is located in the sea line of communication to Japan [and] we are faced with many security-related issues in Asia Pacific, including those in the South China Sea," Wakamiya said.

The TC-90 patrol planes are faster and have longer range than the patrol planes in the inventory of the navy, the Islander aircraft. 

Three more TC-90s are expected to arrive later in the year. – Rappler.com