Who killed Alexei Navalny? His widow’s claim reopens a fraught debate Yulia Navalnaya’s terse, emotional appeal this week — that two foreign laboratories have concluded her husband was poisoned — has turned a private grief into a renewed international crisis. Her demand that the laboratories publish their findings, and her insistence that “Alexei was killed,” sits at the intersection of personal loss, geopolitics and the fraught question of accountability inside a closed and increasingly securitized Russia. The allegation…