Washington (AFP) – US President Joe Biden will use a trip to an emergency NATO summit next week to demonstrate Washington’s “iron-clad” backing for its allies, the White House said Tuesday. Biden will also attend an EU summit in Brussels to discuss Russia’s invasion of Ukraine and Western efforts to impose “economic costs on Russia (and) provide humanitarian support to those affected by the violence,” Press Secretary Jen Psaki told reporters. At the March 24 NATO summit — also in Brussels — Biden will “reaffirm our iron-clad commitment to our NATO allies,” she said. Psaki did not rule out Bi…