Russia has described the decision not to invite its representatives to the Queen's funeral as "profoundly immoral" and "blasphemous".
Leaders and dignitaries from around the world have been invited to the late monarch's state funeral, but Russia's Vladimir Putin and others were snubbed.
"We view this British attempt to use a national tragedy that has touched the hearts of millions of people around the world for geopolitical purposes to settle scores with our country during the days of mourning as profoundly immoral," Russian foreign ministry spokesperson Maria Zakharova said.
"This is especially blasphemous to the memory of Elizabeth II, who is known to have served during World War II in the territorial defence ranks of the British Armed Forces fighting the Nazis," she added.
Ties between the UK and Russia are strained following the February invasion, with Britain taking a lead among Western nations in sending weapons to Ukraine.
Read more on the Queen:
Nearly four-mile queue to see Queen - latest news live
Watch the Queen lying in state
"The unifying image of Queen Elizabeth II, who has not interfered with politics as a matter of principle during her reign, has not become an obstacle to London's dissenting attacks, which are subject to accomplishing their own conjectural objectives," Ms Zakharova said.
"For our part, we express our profound condolences to the British people for the great loss that befell them."