ping
The U.S. under Bush was letting shipments of arms go through Kenya to South Sudan with a wink and a nod. This worked fine until Somali pirates captured a ship full of tanks from Ukraine and exposed the whole thing. The Obama administration reversed our policy, in effect supporting Bashir the Butcher, who is good buddies with Odinga, the PM of Kenya. Remember him? Obama campaigned for him.
The US Ambassador to Kenya, Michael Ranneberger, threatened Kenya in December 2009 with "sweeping sanctions" if they transferred the 33 tanks and ammunition to Southern Sudan, according to the WikiLeaks cables.
However, this position "confused" the Kenyan government. The US was aware of previous, secret shipments under George W Bush, according to a Kenyan official quoted in the cables, but was strongly opposed to the latest delivery of tanks under President Barack Obama.