As tensions escalate between Russia and Ukraine, journalist and writer Tim Marshall examines the geopolitics and geography of the region, and what the scenarios could be if Putin decides to invade https://cnn.it/35lBO6v Correction: This video has been updated to correct the border highlight of Ukraine | CNN International

On the eve of US-Russia talks over the war in Ukraine beginning in Saudi Arabia, Russia's head of its sovereign wealth fund and close Putin adviser, Kirill Dmitriev, spoke to CNN's Matthew Chance about what he expects from the upcoming peace talks. Read more: https://cnn.it/3X5KMN8 | CNN