Looks like two anti-virus vendors are attacking each other:
http://www.networkworld.com/news/2007/071207-update-gloves-come-off-in.html?nlhtsec=0709securityalert5&
There are other options developed in the US.
Kapersky itself was embedded into a piece of malware that removed other malware from computers so who knows what is the underlying cause of all this.
This article makes it sound like you have a choice between one or the other - you don't. There are other vendors that have been doing this longer in the US.