The Collective Security Treaty Organization (CSTO) includes Tajikistan, which has a lengthy border with Afghanistan MOSCOW: A Russia-led security bloc that includes some countries adjacent or close to Afghanistan will hold military drills near the Afghan border in Tajikistan from Oct. 22-23, the RIA news agency reported on Wednesday. The Collective Security Treaty Organization (CSTO) includes Tajikistan, which has a lengthy border with Afghanistan, as well as Kyrgyzstan, Kazakhstan, Armenia and Belarus.