Ties between Libyan rivals 'very tense': Russia's Lavrov Russia's acting Foreign Minister Sergei Lavrov says ties between Libya's eastern military strongman Khalifa Haftar and the head of Tripoli's UN-recognised government Fayez al-Sarraj 'are very tense' and that the rival groups refused to speak to each other, as world powers are preparing to hold a peace conference in Berlin this weekend as they step up efforts to find a lasting ceasefire in the war-ravaged north African country. IMAGES AND SOUNDBITES