German Foreign Minister Heiko Mass said on Sunday there is "a lot of evidence" that Russia is behind the poisoning of opposition leader Alexey Navalny and called on the Russian government to investigate the incident.
Navalny was poisoned with a neurotoxic material and remains in an induced coma in Berlin.
José Levy tells us about two theories that are being discussed in the West, which involve Russian President Vladimir Putin.
Russia, for its part, does not rule out that Western intelligence services have poisoned Navalny.