Any such incursion would be a dangerous escalation of a conflict that has already reportedly claimed thousands of lives and displaced thousands more. Russia, which said it moved into South Ossetia last week to protect pro-Russians there from "genocide" commited by Georgians, has now been accused of "ethnic cleansing" itself. Russia regained total control of Tskhinvali, the capital of South Ossetia, and Georgia offered a unilateral ceasefire as it withdrew all its troops. International opinion hardened against Russia, which has been roundly accused of a "disproportionate reaction" to Georgia's move into South Ossetia last week. Jim Jeffrey, the US's deputy...