Foreign Secretary Boris Johnson has said he wants to see "demonstrations outside the Russian embassy" over Moscow's role in the Syrian conflict, he told the Commons.
An emergency Commons debate is being held into the mounting humanitarian crisis in Syria.
Earlier, former International Development Secretary Andrew Mitchell drew parallels between Russia's actions in Syria and that of the Nazis before World War Two.
Foreign Secretary Boris Johnson has called for International Criminal Court (ICC) procedures against any war crimes - such as airstrikes against hospitals and aid workers - in Syria.
Mr Johnson told MPs that "there could be advantage in ICC procedures".
In a warning to those responsible, he said: "I would remind this House that in recent history war criminals have been successfully prosecuted decades after their offences.
"Those who are conducting this bombing and in my view culpable of these crimes should realise that the mills of justice grind slowly but they grind small."
"The only realistic solution" to the Syrian conflict is a ceasefire followed by a political solution, Mr Johnson added.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.