Ukraine's Prime Minister has urged Moscow to cease military activity in the east and to stop the flow of Russian fighters into separatist-held areas. <br /><br />Ukrainian fighter jets have continued flyovers in the eastern city of Donetsk. <br /><br />It follows Monday's successful military operation to regain control of Donetsk airport. <br /><br />At least 50 armed separatists were killed during that operation.<br /><br />Al Jazeera's David Chater reports from Donetsk.
