This is like poker, China will revail its own cards at the right time to comfort Japan
. With the progress of our naval power, we just shown Amercian that we can go as far as black sea for military exercice, next there will be great Chance that we will do military excercice with Russia near Kurile or in Japan sea with North Korea...China don't run out of option when facing Japan, we will return Japan a favor the most appropriate and most pay off way but we dont cry like baby as Indians when our Sub dock in Sri Lanka
.
If you can cozy with American, what make you think they can't cozy with China, learn India's lesson, they start to feel the pain that 70% of their military harware are still depend on Russia why cozying with American. Vietnam is just a dump yard, it will be disposed when it serve no purpose, you have nothing to offer to Russia beside annoying it with your relation to their enemy.