Britain's warnings of retaliation if it is proven Russia was behind the poisoning of a double agent are propaganda and not serious, Lavrov said on Friday.
Sergei Skripal, a former Russian intelligence officer now living in Britain, and his adult daughter, are critically ill in hospital after being exposed to a nerve agent in the British provincial city of Salisbury.
British media and politicians have claimed the attack on Sergei Skripal, bears the hallmarks of a Russian operation.
Speaking to reporters during a visit to the African Union headquarters in Addis Ababa, Lavrov said Russian officials had not received a single fact or piece of concrete evidence about what happened to Skripal and his daughter.
"What we see is only news reports ... saying that if it is Russia, then a response is going to be given that Russia is going to remember forever. That is not serious. This is propaganda fair and square and it is trying to raise tensions," Lavrov added.
Skripal was a former colonel in Russian military intelligence who was jailed for betraying agents to Britain's MI6 secret service.
In 2010, he was pardoned and then flown to Britain as part of a high-profile spy swap involving Russia and the United States.
