If the supply contract has written terms and conditions, these will set out which law applies.
If the contract does not incorporate any written terms on this, there are global conventions which may apply, for example, The United Nations Convention on Contracts for the International Sale of Goods. This will, however, only apply where there has been a sale of goods and not a supply of goods by way of a disruption agreement.
In the latter case, the parties will be bound by the contract terms and where there are no relevant terms it is open to each party to assess which law applies based on intention of the parties and the factual matrix.
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