Lavrov said Russian officials had not received a single fact or piece of concrete evidence about what happened to Skripal and his daughter...
Agents were in the process of identifying and arresting another illegal immigrant and found that Efthymiou had overstayed his visa...
Government scientists had identified the specific nerve agent but are not saying what it is...
The Kremlin said it was ready to cooperate if Britain asked it for help investigating the incident with Skripal...
