Passengers who has a valid US or Schengen Visa can stay up to 90 days in Serbia or just within the validity period of their related visa's . Schengen visa must be a multiple entry .
Serbia tourist visa is not required for citizens of United Arab Emirates for a stay up to 90 dayswithin a 180 day period.
Check with your airline in case you have connecting flights overseas as part of your journey to Serbia. It may be the case that countries you pass through en route to your destination may require a separate transit visa. Please refer to visa requirements of the specific country.