Editing Law of war (section)

===Declaration of war===
{{Main|Declaration of war}}

Section III of the [[Hague Convention of 1907]] required hostilities to be preceded by a reasoned [[declaration of war]] or by an ultimatum with a conditional declaration of war.

Some treaties, notably the [[United Nations Charter]] (1945) Article 2,<ref>{{cite web |title=Charter of the United Nations, Chapter 1 |url=https://www.un.org/en/charter-united-nations/index.html |website=United Nations |access-date=13 February 2020}}</ref> and other articles in the Charter, seek to curtail the right of member states to declare war; as does the older [[Kellogg–Briand Pact]] of 1928 for those nations who ratified it.<ref>See certified true copy of the text of the treaty in [http://treaties.un.org/doc/Publication/UNTS/LON/Volume%2094/v94.pdf League of Nations, ''Treaty Series'', vol. 94], p. 57 (No. 2137).</ref> These have led to fewer modern armed conflicts being preceded by formal declarations of war, undermining the objectives of the Hague Convention.