British Prime Minister Theresa May issued an ultimatum to the Kremlin to account for how a Russian-made nerve agent ended up in an attack on British soil.

Russia must explain by Tuesday at midnight how Novichok, the rare Russian-manufactured nerve agent, poisoned a former Russian double agent, Sergei Skripal, and his daughter Yulia on March 4 in the town of Salisbury. The two are still fighting for their lives. But with a Russian mea culpa looking highly unlikely, the big question is how...

Continue Reading What happens when Russia ignores the U.K.’s ultimatum over nerve agent attack