According to international law, how should border disputes be resolved?

Negotiation, third-party mediation or good offices.

1. negotiation and consultation: when a border dispute occurs, the relevant countries can resolve their differences through direct dialogue, negotiation and consultation, which requires all parties to fully discuss and exchange territorial, historical and ethnic issues in an equal and respectful manner, so as to reach a mutually beneficial and win-win solution.

2. Third-party mediation or mediation: When the two parties to the dispute cannot be directly resolved, they can seek mediation or mediation from a third party, which can be an international organization, a neighboring country, a neutral country or an independent mediator. These roles are to help the parties find a just and acceptable solution and urge them to reach an agreement.