PREAMBLE TO THE UNITED NATIONS CONVENTION ON THE LAW OF THE SEA
Article58
Rights and duties of other States in the exclusive economic zone
1. In the exclusive economic zone, all
States, whether coastal or land-locked, enjoy, subject to the relevant provisions of this Convention, the freedoms referred to in article 87 of navigation and overflight and of the laying of submarine cables and pipelines, and other internationally lawful uses of the sea related to these freedoms, such as those associated with the operation of ships, aircraft and submarine cables and pipelines, and compatible with the other provisions of this Convention.
2. Articles 88 to 115 and other pertinent rules of international law apply to the exclusive economic zone in so far as they are not incompatible with this Part.
3. In exercising their rights and performing their duties under this Convention in the exclusive economic zone, States shall have due regard to the rights and duties of the coastal State and shall comply with the laws and regulations adopted by the coastal State
in accordance with the provisions of this Convention and other rules of international law in so far as they are not incompatible with this Part.
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It doesnt look like Pakistan can suddenly make a law that no pipelines are allowed in our EEZ, or make regulations for those pipelines....as there is no provision for this under the UNCLOS.
At most Pakistan can take the case to arbitration at international court, where like Baglihar dam, it will come out in favour of India as usual (with maybe one or two restrictions on pipeline diameter etc...for environmental consideration if Pakistan decides to pursue that line of it).
Of course thats the way it looks to me as I read it.
Maybe a legal expert can shed some light into this some more?