Article 37 of Protocol 1 to the Geneva Conventions, signed in 1977, prohibits ”perfidy” – defined as ”acts inviting the confidence of an adversary to lead him to believe that he is entitled to, or is obliged to accord, protection under the rules of international law.”

perfidy (n) 1: betrayal of a trust [syn: perfidiousness, treachery] 2: an act of deliberate betrayal [syn: treachery, betrayal, treason] – source: The Guardian 3.4.2003, p. 23