Well China does have a history with this sort of thing. The Opium wars lead to what China calls the century of humiliation which is still a defining characteristic in their global outlook.
I don't see how it does that, In effect it makes them stronger by giving them a general election she gives them an indyref. All her arguments against one fall away.
Corbyn isn't in Europe or Scandanavia, I'm going to assume your post you're under 30 and in the UK judging by your support for Corbyn. Maybe you should ask yourself why in your lifetime a Labour leader hasn't won an election without dominating the centre of the political spectrum. Corbyn is too far left to win a general election the press have nothing to do with it, Teresa May is becoming increasing right wing and he lacks the common sense to vacate that position.