MOSCOW, Rabi'I 29, 1436, January 20, 2015, SPA -- The Kremlin said on Tuesday increased military activity by government forces in east Ukraine had undermined hopes of arranging a four-way summit on the conflict, Russia's RIA news agency reported, according to Reuters. Western leaders say the efforts to bring together the leaders of Russia, Ukraine, Germany and France are being hampered by Moscow's failure to implement a ceasefire agreement reached more than four months ago. --SPA 14:09 LOCAL TIME 11:09 GMT www.spa.gov.sa/w