Some also chanted "Putin to the Hague", referring to the international criminal court investigating possible war crimes committed in Ukraine.
"Let us be clear, Russia is responsible," US VP Harris said, adding that it would be "a further sign of Putin's brutality" of the death is confirmed.
Goldschmidt, also President of the Conference of European Rabbis, also expressed his condolences to Navalny’s wife Yulia Navalnaya, and his children.
Putin did not specify which types of cancer the proposed vaccines would target nor how.
Putin told US talk-show host Tucker Carlson last week that Russia was ready for "dialogue."
“If Hitler didn’t kill me for being a Jew, then Putin would kill me for being a Ukrainian.”
Putin, 71, who has chosen to run as an independent rather than as the candidate of the ruling United Russia party and who has been Russia's paramount leader since 2000.