Here's a theory
US Sec of State Hillary Rodham Clinton a couple of days back states that Pakistan could face very serious actions if any terrorist strike in US arises out of Pakistan. This comment was in light of the recent failed NY Times square bombing and the fact that the bomber was Pakistani in origin.
A major terrorist attack on US soil is traced back to terrorist bases located in Paksitan-Afghan border. The US vows major punitive actions if the terrorist strikes dont stop or happen again (economic sanction in form of existing handouts being stopped take place). A second strike happens taking American lives and again it is traced back to Pakistani bases of terrorist outfits.
When American aide stops Pakistan stops its anti-terrorist and anti-Pakistani Taliban offensives and this escalate further, the Pakistani regime is toppled by the Army and they take over, General Kayani declare himself president and puts an end to all drone strikes on Pakistani soil. A hot pursuit operation by American forces into pakistan runs into a Pakistani Military element and deaths result in either side. Pakistan says it was attacked and Americans say they have lost their sons to a country which was being given aid till recently. American administration has to act on this and states that it will pursue terrorist elements into Pakistani soil if need be since it has become a haven by virtue of Pakistan military not acting to counter the terrorists because it doesnt have the fund anymore, the funds which were coming in earlier from the US - So it turns into a vicious cycle and in another incident more American forces are ambushed and killed by Pakistani Army.
America declares war on Pakistan - vows regime change there, declares will not let pakistani soil to be used against attacks on America. The islamic world sides with pakistan as it is considered a flag bearer of sorts of the Islamic world. China supports Pakistan secretly providing arms and ammo. American fighters attack Pakistani nuclear site coming up with Chinese assistance and slowly more parties get involved. America woos India into secretly assisting it and anti-Pakistani elements in the Indian Administration gun for an opportunity to hurt pakistan and Iran joins publicly to support Pakistan. North Korea also supports pakistan.
So on one side we have US and its allies ,mainly UK & Canada and they manage to rope in Turkey (for an islamic representative although it only provides - non-combat support)
India in secret
Phase2 Germany, Italy and few other NATO allies join in after heavy US persuasion
France stops supplying parts and support to Pakistan stating tht it is staying away from the war
Israel starts supplying India
Pakistan, North Korea, Egypt, Saudi Arabia, Iran and other Islamic nations
China in Secret
Phase2
Heavy fighting in Pakistan's NWFP and tribal areas and in the Af-Pak border areas
Russia supplies arms and ammo to anybody who is willing to pay cash
Iran attacks a US backed Iraqi regime and supplies to a resurgent Afghan Taliban
and slowly more and more parties get pulled in, countries waging war in secret come out in open China opens a second front for India in its NE region (Lower Tibet) while India is engaged in attacking supposed terrorist infrastructure in (Pakistan Occupied Kashmir /Pakistan Administered Kashmir)
WW III Gentlemen - or have i just spen half an hour on something the mods will delete, despite earlier stuff on this thread being in the same ethical grey area.
EDIT: Such a coincidence tht i saw this now, the SecState Clinton now states that Pakistani officials know where Osama and the Taliban leadership are hiding. All the more reason for US vs Pak to happen and escalate
http://www.domain-b.com/defence/general/20100510_hillary_clinton.html