KIEV, June 11 - Ukraine’s largest natural gas producer, UkrGazVydobuvannya, or UGV, may shut down operation in Donetsk and Luhansk regions as pro-Russian separatists have moved to seize drilling equipment, the company said Wednesday.

The separatist groups seized drilling equipment at five gas wells in the Donetsk and Luhansk regions, including Olshychnaya, Nizhne-Minchenkovskaya, Drobyshevskaya, Yevgeniyevskaya, and Markova.