Darfur borders Libya and Egypt, Egypt has close relations with the US while Libya had reconciliated with the US after the invasion of Iraq. Couldn't the US bribe/coerce Egypt and Libya to send troops into the Sudan?
Zajir,
Oddly enough, that's very much like what the US did with Ethiopia and Somalia. Ethiopia invaded Somalia in 2006 with US acquiescence and it's nice to think that something similar could have occurred with Libya/Egypt and the Sudan.
Sadly, it's when you begin look at the details that the analogy breaks down.
Ethiopia and Somalia have long and nasty history and both have repeatedly attacked each other as far back as the 1400s IIRC. Throw in all the usual ethnic and religious nonsense which always arise in these situations and you've two countries which have loathed each other for centuries.
Ethiopia was also able to do what it did in 2006 and what it's still doing in 2010 because Somalia's neighbors, and the world at large, believe an Ehthiopian invasion is preferable to what's going on in Somalia. Everyone sighed and considered themselves lucky they didn't have to do anything. Even the PRC, that cynical defender of national sovereignty, chose to say nothing.
Now look at the details in Darfur.
First, Libya. The US isn't going to be able to approach Libya about squat. Qadhafi won't bother listening and the US won't bother asking him. Considering the snit Qadhafi has been working himself into over the Swiss arrest of one his sons for assaulting a servant in a hotel, the EU can't ask him either. Furthermore, the EU in the person of France actually fought Libya in Chad during the 1970s when Libya moved in to "assist" that nation put down it's own internal independence movement.
After having to kick Libya out of Chad, no one is going to invite Libya into the Sudan.
Second, Egypt. While that nation would be vehemently opposed to a Libyan intervention, it would also be opposed to intervening itself, especially on the behest of the US or EU. Domestically, the Muslim Brotherhood gets a lot of traction over Egypt's links with the US and EU. They, somewhat correctly, see US aid to Egypt as bribes. Furthermore, any intervention would mean that Egypt is fighting the Arabic, Muslim north of Sudan in order to help the African, Christian southwest of Sudan, Darfur, to secede. Fighting fellow Muslims to help Christians isn't really going to go down to well in the streets of Cairo.
When you look at the details, using Libya/Egypt in the Sudan like Ethiopia has been used on Somalia just doesn't work.
Darfur is a long way from anywhere and an equally long way from anyone even remotely resembling a friend. Helping Darfur is much more involved than just flying a warplane into the region and dropping a bomb.
Bill
Oh, and also you conviniently forgot the Red Sea. 