[joey703]

the U.S. public will not be willing to spend a trillion dollars or send half a million soldiers as to fight for Korea (unless North Korea invades and kills 20,000 U.S. soldiers stationed near the DMZ overnight).

[TigerLikesRooster]

U.S. don't need to commit so much resources. Whatever happens, massive appeasement package or war, S. Korea and Japan will foot the most bill. Most of ground troops will be S. Koreans, too.