As Russia and Ukraine are engaged in conflict, espionage has hit the headlines once again, with documents leaked from the Pentagon highlighting the US has been spying on Russia. All the while, numerous questions emerge; is spying ethical? If so, are both Russia and Ukraine justified in spying? And could spying help bring a swift end to conflict. In this article, Cécile Fabre argues that there is a moral case for spying, but it’s not as clear-cut as one may think.