- A Russian investigative team is scheduled to arrive in Turkey on Tuesday
- Erdogan: Attack won't dampen effort to strengthen ties between Turkey, Russia
- Putin vows to step up fight against terror, saying "criminals will feel the heat"
(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.