You can bring a country to its knees by carefully manipulating its economy, if you have enough control.
Let me take this in another direction by painting 2 fictitious scenarios...
Say instead of the above, 2 things were to happen.
1. A Canadian company bought that London company.
2. japan sells all its US holdings to a wealthy Arab nation.
Which would make the headlines and why?
Everything should be made as simple as possible, but not one bit simpler - Albert Einstein