KIEV, April 21. /ITAR-TASS/. Protesters in Luhansk have announced the establishment of a joint headquarters of South-Western Ukraine which will coordinate efforts of protesters in all other regions, the local media reported Monday. The joint coordination center will be based in Donetsk, the source said.

On Monday, people's gatherings have been held in Luhansk and other settlements of the region to formulate questions which should be put to a referendum the protesters are planning to hold on May 11.

The establishment of a federal state, the status of a subject of a federal state and the status of the Russian language are among issues on the agenda of the planned referendum.

A large-scale meeting of supporters of a federal state was scheduled in Luhansk for 3.00 pm Moscow time Monday.