UNITED NATIONS (Reuters) – U.N. Secretary-General Ban Ki-moon has so far been unable to contact Russian President Dmitry Medvedev by telephone to discuss the crisis in Georgia, a U.N. spokesman said on Friday.

TBILISI (Reuters) – Georgian President Mikheil Saakashvili on Friday said he had signed a ceasefire agreement ending hostilities with Russia over the breakaway region of South Ossetia.

IGOETI, Georgia (Reuters) – A Russian military convoy advanced to within 55 km (34 miles) of Tbilisi on Friday, a Reuters witness said, in the deepest incursion since conflict with Georgia erupted last week.