What will a bank do to get their money back if they lend someone money who is from another country?

I have a mastercard from a bank who trusted me well enough to give me one while I was a resident in a foreign country (AUS). What is a banks policy in regards to non-repayments of the card due to permanent overseas absentia? Is it worth, from their behalf, to chase after you and start issuing a law suit? Is there a specific policy (i.e. to define a specific amount to be the level between them chasing after you or not?)