US President Donald Trump’s pivot away from Ukraine has triggered fresh questions about his attachment to Russian leader Vladimir Putin, the man a top American envoy flattered on Wednesday as a “humanitarian”. Trump has cast his dealings with Putin as part of a mega-deal that has secured the release of American detainee Stephen Hubbard – and which Trump says will end Russia’s war on Ukraine. At the same time, he has repeatedly berated Ukrainian President Volodymyr Zelensky and called for him to...