paris europe big four continental power three african state agree plan monday tackle illegal human traffic support nations struggle contain flow people across desert mediterranean sea 28-nation european union long struggle reach coherent answer influx migrants flee war poverty political upheaval middle east africa crisis test cooperation member state host leaders germany italy spain chad niger libya french president emmanuel macron say time great coordination must act together source countries europe pass transit countries especially libya efficient tell reporters challenge much eu african union meet sparse concrete detail leaders agree principle set mechanism identify legitimate migrants flee war persecution use unite nations register niger chad prevent exploit traffickers core fight illegal migration german chancellor angela merkel tell news conference say berlin will increase efforts want stop human traffickers achieve development aid say migrant crisis put paris rome odds italy accuse france eu state share migrant burden also ask eu commission budget flexibility help tackle crisis nearly 120,000 migrants include refugees enter europe sea far year accord international organization migration 2,400 drown make dangerous journey often without enough food water overcrowd dinghies run people smugglers commit reduce damage death africans desert death africans cross mediterranean chad president idriss deby say fundamental problem always remain development need resources say informal meet outline new specific finance leaders repeat stabilize chaotic libya thousands migrants end embark perilous mediterranean sea journey europe would key long-term solution europeans africans agree renew push tackle migrant crisis