This book gives a strategic defense and warfare analysis of dealing with non-human contact: An Introduction to Planetary Defense: A Study of Modern Warfare Applied to Extra-Terrestrial Invasion by Travis S. Taylor et al.
"This book describes a serious look at defending the planet in the event of an extra-terrestrial invasion. Travis Taylor, et al, have written the definitive book on the defense of earth against a potential alien incursion. Whatever your beliefs on the subject...the book also serves as an important primer on the potential future of warfare on every level. It is tightly grounded in current day realities of war and extrapolates thoughtfully but closely about future potentials. It should be on the reading list of anyone who is serious about national security and the future of war."
And what if such 'entities' are already here, playing poker deals with our ineffectual leaders? Or perhaps the future is one of cooperation not based on fear and paranoia?