LONDON—Antony Blinken, U.S. Secretary of State,  said the West has to be very careful about the exact nature of Chinese investment in Western economies and give careful consideration to investments in strategic assets. China’s spectacular economic and military rise over the past 40 years is among the most significant geopolitical events of recent history, alongside the 1991 fall of the Soviet Union that ended the Cold War. The West has struggled to come up with an agreed policy on China and has flip flopped over the years from seeing China as a lucrative source of investment—for example in U.S. government bonds—to seeing China as a threat to global stability and avoiding its 5G technology. Asked by the BBC if the West should pull back from Chinese investment, Blinken said the United States was not trying to hold China back or contain it, but that the West wanted to uphold the rules-based …