Pretty sure the act of assassination is considered a war crime, and no modern, civilised nation would start a war with war crime. Under Article 8(2)(b)(xi) of

Pretty sure the act of assassination is considered a war crime, and no modern, civilised nation would start a war with war crime. Under Article 8(2)(b)(xi) of the 1998 ICC Statute, “[k]illing or wounding treacherously individuals belonging to the hostile nation or army” is a war crime in international armed conflicts. There is a reason why rules of engagement were created, to minimise civilian casualty, and to reduce suffering for all parties involved.