Today on The Lead: CNN is on the front lines, where Ukraine's fight for freedom is in the trenches. Meanwhile, the CIA director says why he thinks instability in Moscow is creating a unique moment. Then, a holiday block party in Baltimore turns tragic. Now the hunt is on for shooters who opened fire, killing two and injuring nearly 30 others. Plus, can cows help curb the climate crisis? You might have heard their possible gas problems, but this time cattle may be eating their way to a solution.
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