UEFA has warned England and Russia that their teams could be disqualified from the European Championship if there is further violence by their supporters. (Full Euro 2016 Coverage)VIOLENT CLASHESThe warning followed three days of clashes between rival fans in Marseille, and further trouble at the city’s stadium after England and Russia drew 1-1 on Saturday night. (UEFA investigates Russian fan violence at Euro 2016)UEFA says its executive committee has “warned both football associations that – irrespective of any decisions taken by the independent disciplinary bodies relating to incidents inside the stadium – it will not hesitate to impose additional sanctions on the Football Association and the Russian Football Union, including the potential disqualification of their respective teams from the tournament, should such violence occur again.” (Russia salvage 1-1 draw against England)ACTION AGAINST RUSSIAUEFA has only opened a disciplinary case against Russia as the violence caused by England fans on Saturday night was away from the stadium.UEFA is urging the English and Russian football authorities “to appeal to their supporters to behave in a responsible and respectful manner.”‘OBEY THE LAW’Russian football’s governing body has called on fans to “obey the law” after they attacked English supporters in the stadium during Saturday’s 1-1 draw in Marseille. (Dominant England punished by Russia for wasteful finishing)Russia faces UEFA charges of crowd disturbances, racist behavior by fans and the setting off of fireworks at the game, which followed three days of disorder in Marseille’s Old Port district involving English, Russian and French fans.advertisementThe Russian Football Union said it “expresses regret for the disturbances involving Russian fans both outside and actually at the game,” and calls on fans to “respect the opponents and their fans.”The RFU also asks fans not to use banned equipment such as pyrotechnics and laser pointers at games “to avoid disciplinary sanctions” for Russia at upcoming Group B games against Slovakia and Wales. A flare was fired from a section of Russian fans at the end of Saturday’s match.