(Always a good idea to consider the Chief’s opinion.)
The essay is currently a “featured article,” so I think it will be accessible to non-members, at least for a short time. The Chief explains the futility of simply being there, but having no authority to do anything about it.
The article particularly looks at the situation in the Gulf of Maine where a dispute between the US and Canada has resulted in the US Coast Guard essentially taking little or no action against Canadian or other foreign fishing vessels violating waters the US claims as part of its EEZ.
To me an immediate course of action seems obvious.
Take the Gulf of Maine dispute to the International Tribunal. Not only will this result in a resolution of the dispute, it will illustrate for the world that use of the International Tribunal is a proper course for intractable conflict resolution and that its decision should be respected.
Until the tribunal reaches a decision, the US and Canada should agree to continue to allow each others vessels to operate in the area
Meanwhile the US and Canada should agree to firmly enforce their laws against non-US and non-Canadian vessels operating in the area.
Enforcement outside EEZs: Ultimately the UN is going to have to manage fishing on the high seas, limiting it to sustainable levels, otherwise it seems illegal, unregulated, and unreported fishing is going to destroy an essential resource and result in massive food insecurity. How that is going to happen is clearly a long term diplomatic challenge.