Related Rule
Russian Federation
Practice Relating to Rule 8. Definition of Military Objectives
Section D. Weapons and weapon systems
The Russian Federation’s Regulations on the Application of IHL (2001) states: “military objectives include … weapons and military equipment”. 
Russian Federation, Regulations on the Application of International Humanitarian Law by the Armed Forces of the Russian Federation, Ministry of Defence of the Russian Federation, Moscow, 8 August 2001, § 1.
With regard to air and naval operations, the Regulations further states:
When conducting combat operations:
a) in the air – military objectives include –
-military aircraft and
-auxiliary aircraft.
b) at sea – military objectives include –
-war-ships, which means all vessels belonging to the armed forces of a state bearing the external marks which distinguish the war-ships of their nationality; the commander must be in the service of the state, his name figuring on the list of the officers of the fighting fleet or in a similar document; the crew must be subject to military discipline;
-vessels converted into war-ships, namely, those meeting the following conditions: it is placed under the direct authority, immediate control, and responsibility of the power whose flag it flies; bear the external marks which distinguish the war-ships of their nationality; are under the command of an officer who is in the service of the state, his name figuring on the list of the officers of the fighting fleet or in a similar document; the crew must be subject to military discipline.
Possession of weapons by the civil vessel’s crew does not give grounds to consider such class of ships as converted into war-ships. Such vessels shall be considered civil vessels if they are innocently used in their normal role, comply with identification and visit requirements and do not intentionally hamper the movement of war-ships. 
Russian Federation, Regulations on the Application of International Humanitarian Law by the Armed Forces of the Russian Federation, Ministry of Defence of the Russian Federation, Moscow, 8 August 2001, § 89.