The Dark Forest, the second book of Cixin Liu's Remembrance of Earth's Past Trilogy (Three Body Problem) goes into a good bit of exploration of the ramification

The Dark Forest, the second book of Cixin Liu's Remembrance of Earth's Past Trilogy (Three Body Problem) goes into a good bit of exploration of the ramifications of space observation, communication and espionage in combination with relativistic distances starting out with roughly current human technology.