LONDON - Britain is worried about the safety of Kremlin critic Alexei Navalny after he was detained on return to Moscow, British Vaccine Deployment Minister Nadhim Zahawi said on Monday.

Russian police detained Navalny on arrival in Moscow on Sunday after he flew home to Russia from Germany for the first time since he was poisoned last summer.

"The Foreign Secretary will say more about this, but we are very worried about the wellbeing and safety of Alexei Navalny. And of course, we have to make sure that the Russian government answers why a poison was used against Alexei Navalny," Zahawi told Sky.

  - Reuters