11.   Russian ground troops entered Chechnya in late September, after rebels invaded the neighboring Russian region of Dagestan last summer.

12.   The campaign came after Chechen-based rebels invaded neighboring republic of Dagestan.

13.   The Kremlin said the renewed offensive was necessary after Chechen-based rebels twice invaded the neighboring region of Dagestan.

14.   The offensive began after rebels invaded the neighboring Russian region of Dagestan last summer.

15.   The latest offensive began after rebels invaded a neighboring region and following apartment bombings around Russia that were blamed on the rebels.

16.   The rebels invaded the city of Budyonnovsk on Wednesday and demanded an end to the war in Chechnya.