Suspected Poisoning of Russian Ex-Spy Recalls Litvinenko Death, U.K.’s Johnson Says

SALISBURY, England—British Foreign Secretary Boris Johnson said the suspected poisoning at the weekend of a former Russian intelligence officer living in Britain recalled the 2006 assassination of Kremlin opponent Alexander Litvinenko.

Sergei Skripal, a 66-year-old former colonel in Russia’s military intelligence, remained in critical condition in a hospital Tuesday. He and his 33-year-old daughter, Yulia, were found unconscious on a bench outside a shopping mall in Salisbury, southwest England, on Sunday afternoon.