Who can initiate an optional referendum at the national level?

Ukraine
- President
- Legislative majority
- Registered electors
Constitution (1996)
http://www.infoukes.com/history/constitution/index-en.html
- An All-Ukrainian referendum is designated by the Verkhovna Rada ofUkraine or by the President of Ukraine, in accordance with their authorityestablished by this Constitution.
- An All-Ukrainian referendum is called on popular initiative on therequest of no less than three million citizens of Ukraine who have the right tovote, on the condition that the signatures in favour of designating thereferendum have been collected i n no less than two-thirds of the oblasts, withno less than 100 000 signatures in each oblast.