You can't marry another person as long as you are still legally married to someone in another country. It doesn't matter that you don't have communications with that person...you need to get a divorce first and then proceed with the new marriage.
It's ILLEGAL last time I checked...your new marriage will be cancelled ... but there's another thing....
at your embassy when you'll go and ask for the papers in order to go ahead you will need to bring from your country a statement from the Government ( or the civil state ) in which is stipulated that you are not married or if so, the paper that proves that you are divorced .
I am from Romania and last year I got married with an Egyptian , that's how I know.