TODAY: Russian fighter jet shot down near Turkey’s border; Kremlin asserts it was over Syrian territory despite conflicting reports from Ankara; Putin and Khamenei close ranks over distrustful Washington in meeting in Tehran; trade ties bolstered; activists detained over Ukraine flag stunt; Moscow mulls retaliatory measures against Kiev for Crimea power line sabotage; Union for NGOs proposed; IMF suggests Russia relax some emergency measures from last year’s banking crisis.