ISIS fighters amassing in Afghanistan near Tajik

"The Tajik-Afghan border has spotted a concentration of militants of the terrorist movement Wilayat Khorasan, the Afghan affiliate of the Islamic State," Serdyukov told a briefing.

The number of militant training camps is growing rapidly in the northern provinces of Afghanistan, he said, adding that, in general, developments in the CSTO's area of responsibility have taken on a "negative trend."

The CSTO is a regional interstate organisation created in 1992 that consists of six countries of the former USSR: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia and Tajikistan. The main purpose of the CSTO is to protect its member states from external armed aggression.

(With UNI/SPUTNIK inputs)