Police have warned England fans travelling to the Russia World Cup to be cautious about bringing St George's Cross flags and "waving them about in public" - because they're at risk of coming across as "imperialistic".
The head of football policing said that the flags have become a "trophy of choice" for hooligans from rival countries.
"I think people need to be really careful with flags". "It can come across as nearly imperialistic... and can cause antagonism".
"We would not expect people to come across to this country, get drunk and drape flags on the Cenotaph, so we need to extend the same courtesy when we go overseas", he said.
Mr Roberts will bring a team of English police to join Russian security services in helping to protect English fans.
In tit-for-tat diplomatic retaliation, Moscow expelled the United Kingdom diplomat in charge of looking after British football fans during this summer's tournament.
He said: "Some of them have particularly strong opinions about how people in Britain should adopt to our way of life and the corollary of that when we go somewhere else then you have to respect their culture".
English fans have been told be on their best behaviour in Volgograd - formerly Stalingrad.
Boris Johnson has said English football fans will have to rely on Russian "honour" to ensure their safety at the football World Cup. Deputy Chief Constable Mark Roberts, of the National Police Chiefs' Council, said that he was acutely aware of the worsening diplomatic situation after Russian Federation was accused of carrying out the Salisbury poisonings.
Following clashes between Russia and England fans at the 2016 European Championship in Marseille, Russian ultras proudly posted images on social media of "captured" England flags.