BEIRUT (Reuters) - Opposition fighters battled Syrian government forces in Damascus into the early hours of Monday in what residents described as the fiercest fighting yet inside the capital. Activists said the fighting spread from the south of the city to a second area as night fell. At least five people were killed and dozens wounded, locals said. The spread of fighting came as U.N. peace mediator Kofi Annan was due to fly to Moscow for a two-day visit in which he will meet Russian President Vladimir Putin who has resisted Western calls to increase pressure on Syrian leader Bashar al-Assad. ...