The Canadian prime minister, Mark Carney, has said the United States is no longer a reliable partner after President Donald Trump imposed 25% tariffs on car imports. Rahul Tandon speaks to businesses in both the US and Canada. China's biggest company, Tencent Holdings, has made more than a billion-dollar investment in a new spin-off company of the French gaming giant Ubisoft, which owns franchises including Assassin’s Creed and Tom Clancy’s Rainbow Six.