Joe Biden made a potentially dangerous statement on Monday. In Tokyo, he gave a flat “yes” to a reporter’s question of whether he was willing to “get involved militarily to defend Taiwan”. “That’s the commitment we made,” the president claimed. In fact, the United States scrapped its formal commitment to defend Taiwan in 1979, replacing a treaty of alliance with the Taiwan Relations Act, which obligates the United States to help equip Taiwan to defend itself. This is the third time in less than a year that Biden has publicly declared that the United States would use force to keep…