Japanese submarines can control fertiles from China to the Pacific Ocean, supporting the US ally in the potential conflict scenario.

China is working hard to modernize and expand the scale of naval forces, but still faces a series of difficult points to overcome, one of them is geographical location.

Satellite photos show that the Chinese coast is surrounded by light blue waters, in contrast to deep-green waters with dark green watercolor to close to the eastern Taiwan island and Japan.

Japanese submarines can immediately dive into deep and hiding the sea, while Chinese forces have no advantage.

A Japanese Soryu submarine emerged in rehearsal in 2019. Photo: JMSDF.

US President Joe Biden and Japanese Prime Minister Yoshihide Suga on April 16, the general announcement emphasized "the importance of peace and stability in Taiwan Strait", marking the first two-country leaders mentioned

US Defense Minister Lloyd Austin last week also suggested the concept of "integrating deterrent", which called for allies to coordinate closely to prepare for a future war, with distant characteristics

Jeffrey Hornung, a political scientist at the US Rand Institute, said that controlling the marine qualities is Japan's most important contribution to the US Coalition in the script of military conflict with China.

According to Hornung, these "weak maid" are located along Nansei islands, stretching from the south of Kyushu island to the north of Taiwan Island.

This is part of the "First Island Chain", the term refers to the area inside the belt connected from the Kuril Islands via Japan, Okinawa Island, Taiwan Island and to the Philippines.

"When the conflict broke out, Defense Japan could mobilize submarines and torpedo to fully seal these qualities, forcing Chinese warships to move around the Taiwan Island or head into the space

In a period, Chinese warships often had to move through the Miyako Strait to go to the Pacific Ocean.

Location of the first island chain and the second island series.

Shugart said that Diesel - Japanese electrical team is the best plan for the task of blocking the Chinese Naval Road.

Japan is paying 20 diesel-electrical submarines Oyashio and Soryu, in which SoyRu is considered one of the most difficult submarines in the world, across Russia's 636 scheme and Type-209 Germany.

The US and allies are looking for many options to deal with China's growing combat capacity.