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Those Islands are not strategically importants...we just want Vietnam pay expensive expeditions to guard those inslands for us...until when we decide to take them back...remember this : the monk can't never run away from it temple...we know where to get you.
As for Mongol, we won the war and we lost the war...it's normal in military business but I never said we expend our claw on Mongol..but you Vietnam are within our claw for millenium...and no matter how you send S.O.S signal...you never escate China's gravity...and don't flatter yourself that we begged for hiding under great Viet's , at that time Vietnames were only second class citizen on it own country, We chinese were the first class citizens, we don't pay tax, we have the right to enslave Vietnamese as servants and enjoy the freedom of been the owner of the tributary state
...even all your top gorvernment officials have to learn Chinese language and the way to rule your people.