 October 1, 1999 – December 31, 1999 - During the initial invasion in 1999, 559 Russian soldiers were killed.January 1, 2000 – December 31, 2000 - During the initial invasion and the following Chechen Insurgency in 2000, 1,410 Russian soldiers were killed.January 1, 2001 – December 31, 2001 - During the Chechen insurgency in 2001, 504 Russian soldiers were killed.