By Tony Munroe, Andrew Osborn and Humeyra Pamuk BEIJING/ MOSCOW/WASHINGTON (Reuters) – China and Russia on the opening day of the Winter Olympics declared a “no limits” partnership, backing each other over standoffs on Ukraine and Taiwan with a promise to collaborate more against the West. President Xi Jinping hosted President Vladimir Putin on Friday as the two nations said their relationship was superior to any Cold War era alliance and they would work together on space, climate change, artificial intelligence and control of the internet. Beijing supported Russia’s demand that Ukraine should…