The Moscow terror attack could drive a wedge between Russia and one of its longtime allies

• Russia says suspects in the Moscow terror attack came from Tajikistan, something the country denies.
• Tajikistan and Russia are allies, but tensions have been growing between them.
• Tensions have also been growing between Russia and other former Soviet republics.

Russia's response to the weekend terror attack in Moscow could drive a wedge between the country and one of its historic allies.