As Russia gears up for bloodier phase of war, reports indicate a chemical weapon was used in Mariupol 

Russia is resupplying and reinforcing its invasion force in eastern Ukraine with a long convoy of vehicles heading to the region, indicating a new phase of the war is likely to occur there, according to a senior Pentagon official.

https://www.usatoday.com/story/news/politics/2022/04/11/ukraine-russia-invasion-live-updates/9535346002/