Enforcement of a foreign court judgement in the UAE

Hi,

We are UAE FZ Company. A US (Californian) Supplier is threatening to take us to court (in California), over an unpaid invoice, for year 3 of a 3-year service contract.

The UAE end user only used the system for a few months & only paid us for 2 years. We informally cancelled, verbally, the 3rd year.

My question is: if they manage to achieve a judgement against us in the USA, is it enforceable in the UAE?

P.