The classical problem (VCT Article 75 preserves it outside the Convention's machinery): what happens to treaties between belligerents when war (now: armed conflict) erupts? The settled doctrine's map:
1. Political/bipartite treaties (alliance, friendship — the 1950-type) — terminated orsuspended (the incompatibility of hostilities with the treaty's basis);
2. Law-making/multilateral conventions (Geneva, human-rights covenants) — continue (indeed operate more intensely: the humanitarian law's activation);
3. Dispositive/territorial treaties (boundaries, cessions) — continue (the rebus bar on boundary treaties' twin: the map outlives the war);
4. Humanitarian/cross-border-transactional treaties (prisoner exchanges, health, communications) — continue pro tanto;
5. The modern refinement (ILC's effects-of-armed-conflict work): the "intention of the parties" test + the treaty's subject-matter compatibility with conflict — the outbreak of conflict suspends/terminates some treaties, revives others upon peace (jus post bellum).