(CNN)A gunman shouting "Do not forget Aleppo!" assassinated Russia's ambassador to Turkey at an Ankara art gallery on Monday in what leaders of Russia and Turkey called a provocative terror attack.
Ambassador Andrey Karlov's shooting was captured in real time in photos and video that quickly spread through the Internet worldwide.
The assassination comes at a time of improved relations and increased cooperation between Russia and Turkey. Leaders of both countries vowed to not let the assassination cast a shadow over that friendship. It also comes during a pivotal moment in Syria, where Russia has been instrumental in President Bashar al-Assad's push to retake rebel-held parts of Syria.
