Alexey Navalny, the prominent opponent of Russian President Vladimir Putin, is imprisoned in conditions that amount to torture and may slowly be killing him, human rights group Amnesty International said on Wednesday. Navalny, who last year was poisoned with a military-grade nerve agent, was now being subjected to sleep deprivation and did not have access to a doctor he could trust in jail, it said. “Russia, the Russian authorities, may be placing him into a situation of a slow death and seeking to hide what is happening to him,” Agnes Callamard, Amnesty International’s secretary general, said ahead of the publication of the group’s annual report. “Clearly the Russian authorities are violating his rights. We have to do more,” she said. “[They] have already attempted to kill him, they are n...