May won the backing of 27 other EU leaders at a summit Thursday and the bloc called the attack a "grave challenge to our shared security." The EU states said they would "coordinate on the consequences to be drawn in the light of the answers provided by the Russian authorities." "This is about us standing together to uphold our values against the Russian threat," she said. May said Thursday that "it is clear that the Russian threat doesn't respect borders." Britain and Russia have expelled 23 of each other's diplomats in a dispute showing no sign of easing.

Source: ABC News March 22, 2018 13:57 UTC