Well, I don't know about some of these.
But there is tension between China-Japan.
Think about what this means for the Watchtower - it's exactly what it needs
This will be interpreted as King of North/South rising, etc. because they were last seen in the Cold War - so we have Russia formerly, and now via link of communism, it will be said China has taken it's place, and well, the US/UK superpower was previously said to be other king as well as current world power, they will jump to help Japan, which was practically made into a US colony in 1945, with US army instead of it's own.
New military guidelines, announced in December 2010, will direct the Japanese self-defence forces away from its Cold War focus on USSR (now Russian Federation) to a focus on China, especially regarding the dispute over the Senkaku Islands - so it's similar to the Cold War, basically capitalism/democracy vs communism again.
This will fit so nicely into their prophecy, cause some probably to panic and return to the meetings or not leave the 'Truth' so they don't die in Armageddon. It's just what they need to whip up support, to make members believe they have the truth - through the 70s, and 80s, fear of nuclear war made people worried, it was great for ministry.
The war may never happen, but US/Russia never went directly to war, but the worry still did the ministry good.
The wall may be short like UK stopping Argentina bullying people of the Falklands, but no one will know how long the war will be to it finishes, so people will panic it's World War 3. The war likely will be short, no more a World War than the Iraq conflict or Middle East crisis, but more will be made of it, just as brothers tried to see Iraq as more than it was.
The predicition of war isn't unrealistic.
Tension slowly built up between European countries before World War one, like sticks being thrown onto a fireplace, and then one day, the match that sparked the fire, and all hell broke loose, with all the frustration coming forth. USA/Europe have long been uncomfortable with China rising, as they fear their economies will be affected (recession has no connection, but doesn't help - people do stupid things when economy is affected, such as recession causing Germans to support Nazis in ironically wanting war to solve their economic problems), and people are saying things like soon we will all have to learn Chinese, etc. when they become the world power. Tension is slowly brewing, Obama doing the 'pivot to Asia', and China wants more influence.
US involvement to protect Japan isn't unrealistic
Britain joined the World War 1 to protect Belgium, and WW2 to protect Poland. USA will likewise be obligated to support Japan, for Japan changing it's ways and cooperating with the USA after WW2 - the USA abolished the Japanese army and replaced it with very limited self-defence forces - Japan may spend a lot of defence, but China is a fair threat to it: China has nuclear bombs, but the USA refused Japan such - even today Japan has USA defence bases.
Under the terms of the Mutual Security Assistance Pact, ratified in 1952 along with the peace treaty Japan had signed with the United States and other countries, United States forces stationed in Japan were to deal with external aggression against Japan while Japanese forces, both ground and maritime, would deal with internal threats and natural disasters
If the USA really fills threatened by China, war isn't nonsense. Iraq has been well theorised to be oil/finance driven. USA has it's allies in the Middle East, and Japan is an ally it needs in Asia to stop Chinese dominance.
Japan has also deepened its security and military ties with Australia, and I expect the UK will be keen to suppot America, as will some other countries of the European Union. I expect this will escalate to "the West" vs China.
