Putin threatens 'lightning fast' retaliation if nations intervene; UK says West must 'double down' on Ukraine support. Follow our live updates

Putin threatens 'lightning fast' retaliation if nations intervene; UK says West must 'double down' on Ukraine support. Follow our live updates This is a developing news story. Please check back for updates: https://www.cnbc.com/2022/04/28/russia-ukraine-live-updates.html Follow @CNBCnow for breaking news and real-time market updates Unsubscribe Manage Newsletters Terms of Service Join the CNBC Panel   Digital Products Feedback Privacy Policy CNBC Events   © 2022 CNBC LLC. All rights reserved. A property of NBCUniversal. 900 Sylvan Avenue, Englewood Cliffs, NJ 07632 Data is a real-time snapshot *Data is delayed at least 15 minutes. Global Business and Financial News, Stock Quotes and Market Data and Analysis. Data also provided by THOMSON REUTERS