Update for Russian military operations in Ukraine for May 21, 2022: 1. Ukrainian militants in the Azovstal steel works have unconditionally surrendered numbering between hundreds (current Red Cross count) to thousands according to Russian sources; 2. Mariupol has been secured by Russia since mid to late-April - Ukraine finally admits however that its “combat operations” have fully ended; 3. Russia continues to make progress in the Donbas region - Ukrainian forces are being encircled in Severodonestsk and Lysychansk - the salient around Papasnya is expanding both west and north as part of this major encirclement; 4. Pentagon admits Russia still poses the majority of its combat power - possess a “numerical advantage” over Ukraine - and is making “slow, uneven” progress, but progress nonetheless; 5. Kharkov “offensive” has either stalled or is in the process of being rolled back; 6. US M777 howitzers have been found, tracked, targeted, and destroyed by Russian forces; 7. Additional attempts to send heavy weapons will face similar technical, tactical, strategic, and manpower challenges; References US Department of Defense - Pentagon Press Secretary John F. Kirby Holds a Press Briefing - May 20, 2022: https://www.defense.gov/News/Transcripts/Transcript/Article/3039550/pentagon-press-secretary-john-f-kirby-holds-a-press-briefing/ US Department of Defense - Senior Defense Official Holds a Background Briefing May 19, 2022: https://www.defense.gov/News/Transcripts/Transcript/Article/3038153/senior-defense-official-holds-a-background-briefing/ TASS - Leader of Azov battalion transferred from Azovstal plant in armored vehicle - top brass: https://tass.com/defense/1454085 SouthFront - IN VIDEO: RUSSIAN DRONE, ARTILLERY DESTROY UKRAINE’S NEW M777 HOWITZERS: https://southfront.org/in-video-russian-drone-artillery-destroy-ukraines-new-m777-howitzers/ Institute for the Study of War - RUSSIAN OFFENSIVE CAMPAIGN ASSESSMENT, MAY 20: https://understandingwar.org/backgrounder/russian-offensive-campaign-assessment-may-20