Using the IRAC Method I need help answering this:

Background:

Carmen runs a business that buys wood from Spain, makes toys in Russia, then sells these to Australian companies for resale. Carmen runs her business from Russia. One day, the company she purchases the wood from in Spain fails to make a delivery Carmen had paid for in advance. The very next day, despite making a shipment of toys to her largest Australian client, the company refuses to pay for the toys. Neither company provides a reason for their actions to Carmen.

Advise Carmen on the remedies available to her under the relevant international convention.

Note: All countries are treaty members of the relevant convention. Please cite specific principles and related international conventions and articles in your advice.