More than a dozen U.S. researchers, physicians and public health experts, many of them from the Centers for Disease Control and Prevention, were working full time at the Geneva headquarters of the World Health Organization as the novel coronavirus emerged late last year and transmitted real-time information about its discovery and spread in China to the Trump administration, according to U.S. and international officials.

The Trump administration is moving toward handing back to Russia two diplomatic compounds, near New York City and on Maryland’s Eastern Shore, that its officials were ejected from in late December as punishment for Moscow’s interference in the 2016 presidential election.