US president Joe Biden (right) speaks with Taoiseach Leo Varadkar, as he departs from Farmleigh House, Phoenix Park on April 13th. Photograph: Leon Neal/Getty Images Taoiseach Leo Varadkar and US president Joe Biden discussed “the challenges posed by China” among other issues at their private talks last Thursday, US officials have said. The headings for the talks were contained in an official readout released by the White House. However, neither Mr Varadkar’s office nor the White House provided details subsequently on what they had discussed regarding China. China had not been mentioned by the US side in earlier briefings as...