brussels nato ally tuesday welcome president donald trump decision commit force afghanistan part new u.s. strategy say would require troop fund america partner run white house last year pledge withdraw swiftly afghanistan trump reverse course monday promise stepped-up military campaign taliban insurgents say troop fight win u.s. officials say sign plan send 4,000 u.s. troop add roughly 8,400 deploy afghanistan speech define benchmarks successfully end war begin u.s.-led invasion afghanistan 2001 acknowledge require extraordinary sacrifice blood treasure ask nato ally global partner support new strategy additional troop fund increase line confident trump say comment signal would increase pressure u.s. partner already jolt repeat demand step contributions nato description alliance obsolete even though since take office say long case nato secretary general jens stoltenberg say statement nato remain fully commit afghanistan look forward discuss way ahead defense secretary jam mattis ally international partner nato 12,000 troop afghanistan 15 countries pledge stoltenberg say britain lead nato member call u.s. commitment welcome call secretary mattis yesterday agree despite challenge stay course afghanistan help build fragile democracy reduce terrorist threat west defence secretary michael fallon say germany bear brunt trump criticism scale defense spend also welcome new u.s. plan continue commitment necessary path stabilize country government spokeswoman say june european ally already pledge troop give detail number wait trump administration outline strategy region.nearly 16 years u.s.-led invasion response sept. 11 attack plan al qaeda leader osama bin lade afghanistan country still struggle weak central government taliban insurgency trump say share frustration american people weary war without victory hasty withdrawal would create vacuum group like islamic state al qaeda fill 'fully commit nato back new u.s. approach afghanistan