U.K. supported by allies on Russian role in poison attack

LONDON — The leaders of the United States, France, Germany and Canada on Thursday endorsed Britain’s assessment that a nerve-agent attack on a former Russian spy and his daughter in March was conducted by Russian military officers and “almost certainly” approved at a senior level of the Russian government.

The leaders urged Russia to provide a “full disclosure” of its Novichok nerve-agent program and said they would “continue to disrupt together the hostile activities of foreign intelligence networks on our territories.”

During an emergency meeting of the U.N. Security Council called by Britain to brief diplomats on the investigation, top Russian envoy Vassily Nebenzia denounced the accusations, calling them base untruths aimed at whipping up hostility toward Moscow.