Tired of the same approach (Score -1)

"The new aircraft would offer a combination of speed, altitude and stealth that could make it virtually impervious to ground-based missiles, sources said. Even the SR-71 is said to have evaded hundreds of missiles fired at it during its long career, although some aircraft sustained minor damage" 1) Engine is an air-breather. 2) Uses aerodynamic lift. Why couldnt we/enemy create either nano or biological (or both) spreadable agents/clouds to reduce oxygen in the vicinity of travel so the engines fail. Why couldnt we/enemy counter this with abrasive nano-particle(diamond based) clouds (kinda like nano-flak) to eat away the surfaces as it flies