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Yes, you can travel from Europe to the UAE without issue (in fact, I'm doing exactly that tomorrow).
"Onward" tickets are required by many countries. Basically it just means that you need a ticket out of their country, as some level of proof that you will be leaving when your stay there is complete. That ticket could be back to your home country (ie, India), or some other third country - as long as you have a ticket and generally have the required paperwork (eg, visas) to visit that country then you'll be fine.