All the theories Russia is pushing to claim they weren't behind the nerve agent attack on a former spy in the UK

AP

Sergei Skripal, the poisoned ex-spy, in 2006.

Britain has accused Russia of trying to kill former spy Sergei Skripal and his daughter with a deadly nerve agent - but the Kremlin is fighting back.

The UK blamed Russia partly on the grounds that Novichok, the poison used in the attack, was developed in the former Soviet Union. Allies including the US, France, and Germany have agreed that this is the only plausible explanation.

Regardless, the Kremlin has denied all involvement. Instead Russian officials and state media outlets have promoted numerous alternative theories which they claim could lead to the real culprits.

Scroll down to read what they are.