From the Los Angeles Times (abridged)
U.S. bombers defy China restrictions
Two fly through a newly declared (Chinese) air defense zone.
Defense Secretary Chuck Hagel reaffirmed the United States’ commitment to the mutual defense treaty with Japan and said the U.S. considered the Senkaku islands to fall under that treaty.
Are we to believe that the United States would go to war if the unpopulated Senkaku Islands (China calls them the Diaoyu Islands) are attacked? Would we fight to defend Japan proper if it were attacked over a dispute for control of the unpopulated islands?
An even more important question is will the United States honor the list of mutual defense treaties that have been negotiated, signed, and approved by the United States Senate? The list is long.
Japan
NATO
- At present, NATO has 28 members. In 1949, there were 12 founding members of the Alliance: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom and the United States. The other member countries are: Greece and Turkey (1952), Germany (1955), Spain (1982), the Czech Republic, Hungary and Poland (1999), Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia, Slovenia (2004), and Albania and Croatia (2009).
Philippines
ANZUS military alliance
- Australia
- New Zealand
South Korea
Taiwan
So let’s imagine that China decides to take control of Taiwan by force. Is the United States prepared to face war with China to defend the freedom of Taiwan? China seems to be taking an evermore controlling position in the East China Sea and the South China Sea.
Is the United States prepared to confront China? Apparently the USA did defend its rights this time with a flyover. If the situation becomes more heated will congress honor America’s commitments?
Coast Contact 
That is a very good question