القاعدة ذات الصلة
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 7. The Principle of Distinction between Civilian Objects and Military Objectives
Section A. The principle of distinction
The UK LOAC Manual (2004) states: “Parties to the conflict shall at all times distinguish between civilians or other protected persons and combatants and between civilian or exempt objects and military objectives.” 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 12.19; see also § 13.25 (maritime warfare).
With regard to internal armed conflict, the manual states:
15.9. Attacks are to be directed only against objects or areas which, at the time the attack is launched, are of tactical or strategic military importance.
15.9.1. There is no definition of military objectives or attacks in the treaty law dealing with non-international armed conflicts. Nevertheless, the definitions used in respect of international armed conflicts should be treated as applicable. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, §§ 15.9.– 15.9.1.
The UK LOAC Manual (2004), as amended in 2010, states:
Since military operations are to be conducted only against the enemy’s armed forces and military objectives, there must be a clear distinction … between objects that might legitimately be attacked and those that are protected from attack. The principle of distinction … separates legitimate targets, namely military objectives, from civilian objects. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, as amended by Amendment 3, Ministry of Defence, September 2010, §§ 2.5–2.5.1.
15.9. Attacks are to be directed only against objects or areas which, at the time the attack is launched, are of tactical or strategic military importance so as to amount to military objectives. 
United Kingdom, The Manual of the Law of Armed Conflict, Joint Services Publication 383, Ministry of Defence, 1 July 2004, as amended by Amendment 7, Ministry of Defence, May 2013, § 15.9.
In reply to a question in the House of Lords concerning the Gulf War, the UK Parliamentary Under-Secretary of State of the Ministry of Defence stated:
The Geneva Conventions contain no provisions expressly regulating targeting in armed conflict. The Hague Regulations of 1907 and customary international law do, however, incorporate the twin principles of distinction between military and civilian objects, and of proportionality so far as the risk of collateral civilian damage from an attack on a military objective is concerned. These principles and associated rules of international law were observed at all times by coalition forces in the planning and execution of attacks against Iraq. 
United Kingdom, House of Lords, Statement by the Parliamentary Under-Secretary of State for Defence, 22 July 1991, Hansard, Vol. 531, Written Answers, col. 43.
In its written statement submitted to the ICJ in the Nuclear Weapons case in 1995, the United Kingdom stated: “The parties to an armed conflict are required to discriminate between civilians and civilian objects on the one hand and combatants and military objectives on the other and to direct their attacks only against the latter.” 
United Kingdom, Written statement submitted to the ICJ, Nuclear Weapons case, 16 June 1995, § 3.67.