A couple thing:
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There was a potential peace deal in April 2022, just after Russia’s full-scale invasion of Ukraine in February. At that time, Ukraine and Russia appeared close to agreeing on a 10-point peace plan during talks in Istanbul, Turkey. Boris Johnson persuaded Zelenskyy to abandon the talks. It’s all documented. Johnson has a lot to answer for.
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It’s quite right that most of the DSA’s focus is on the impact of America’s actions in the world, not Russia’s.
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Unilateral US sanctions can cause some inconvenience to wealthy, powerful targets, but above all, they have been proven to cause widespread and often deadly harm to people who certainly don’t deserve it. See https://www.thelancet.com/journals/langlo/article/PIIS2214-109X(25)00189-5/fulltext