Is this threat realistically possible-in-actuality.,

Well, do you think this actually possible for the top hegemon to do - SUCCESSFULLY:

http://www.xinhuanet.com/english/

To execute it will mean a:

Land war in Asia.

And this is the one thing that the Pentagon is dead against because it is in fact:

UNWINNABLE!

The US led the UN force in the Korean War and could not win it.

It had its fling in Vietnam and it certainly did not win that war.

It could win the 2001 Afghanistan War even by outsourcing it to NATO.

It certainly did not win the 2003 War on Weapons of Mass Destruction.

It was only triumphant in Grenada and Panama.

It was shamed in its military doings in Nicaragua under Ollie North.

All in all, the Pentagon top brass is right on! 

NO ASIAN WAR!