Mourners continued to pay their respects to Alexei Navalny at Moscow’s Borisovsky Cemetery on Sunday, two days after the Russian dissident was buried, as police looked on but did not intervene. Mourners were permitted to lay flowers on the grave, a dpa journalist at the scene reported. Young people, the elderly and families with children laid flowers on the grave, which lies close to the cemetery’s entrance. Many were in tears and embraced each other. “Heroes do not die. Thank you Alexei” was written on a cardboard poster at the grave. Among the wreaths there were also children’s toys. A Russi…