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There was speculation that Dneiper and the canal feeding Crimea could be a reason for an incursion into Ukraine. (Crimea has virtually no fresh water https://www.bloomberg.com/opinion/articles/2021-03-19/russia-vs-ukraine-crimea-s-water-crisis-is-an-impossible-problem-for-putin)
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Canal already unblocked and flowing again apparently
https://twitter.com/OSINT_Ukraine/status/1496905848219656204
A lot of speculation was he would stop at the Dneiper and not get bogged down in Western Ukraine but who knows