After four years of virtual stalemate in Ukraine, both Kyiv and the Kremlin are trying to use the war in Iran to their own advantage. President Zelensky visited the Middle East, offering battle-tested expertise on fending off Iran's done attacks, while Russia reportedly backs Iran with critical intelligence and weapons support, and for now, gains from soaring global oil prices. Zelensky joined Christiane from Kyiv. 

Also on today's show: historian Timothy Snyder; Mercy Corps CEO Tjada D'Oyen McKenna