Alain Juppé says that NATO isn't doing enough in Libya. Despite France's willingness to go it alone in the Libyan operation, its capacity to sustain an extended campaign was always in doubt. Juppé didn't specify what help he wants from NATO, but it's simply a fact that France, even with the UK, is insufficiently equipped in planes, carriers, cruise missiles, and airborne surveillance capabilities to carry on a long fight without assistance. NATO is of course a polite way of bringing in US forces and supplies beyond the AWACS that are still flying in support of the Libyan mission.
More details here, particularly concerning A10 Warthog "tank-killer" aircraft.