The Cipher Brief Open Source Report for Monday, March 21, 2022

Topping the news today: Ukrainian President Volodomyr Zelenskiy has rejected a Russian demand to surrender the city of Mariupol: US missile defense deploys in Slovakia; Biden to speak with European leaders ahead of Europe visit and Saudi Arabia to boost oil production investment. Let’s get to the rest of today’s report and remember you can always find links to our source material in the Cipher Brief’s free daily newsletter, sign up at thecipherbrief.com.