The prime minister will join world leaders as they vow to "ratchet up pressure on Russia's war machine".
Axel Rudakubana was jailed for a minimum of 52 years in January over the murder of three girls.
Six Bulgarians will be sentenced at the Old Bailey in London on Monday for their part in a Russian spy
The investigation is separate to an alleged plot to target the Israeli embassy in London.
Hundreds of heavy metal fans watch on as the 2.25m sculpture is revealed in the frontman's hometown.
Economic pressures are forcing Donald Trump and Xi Jinping to seek an off-ramp in the trade war.
The relationship between China and Russia is no longer one of equals.
De Niro is to receive the award in the festival's opening ceremony on May 13.
He died earlier this week after a year-long battle with brain cancer, his representative said Friday (May 9).