THREE Three weeks into a hunger strike that threatens to kill him, Alexei Navalny made light of his skeletal state in a darkly humorous social media post on Tuesday and said he was grateful for support from Russia and around the world. The Russian opposition leader was transferred on Sunday to a prison hospital in Vladimir, east of Moscow, after starving himself since March 31 in protest at the refusal of authorities to grant him access to his own doctors. In a post on Instagram, he told his supporters they would laugh if they could see him staggering round his…