The Kremlin said on Saturday that the West was behaving like bandits but that Russia was far too big to be isolated as the world was much larger than just the United States and Europe.

Kremlin spokesman Dmitry Peskov told reporters that the West was engaged in "economic baditry" against Russia and that Moscow would respond. He did not specify what response there would be but said it would be in line with Russian interests.

"This does not mean Russia is isolated," Peskov told reporters. "The world is too big for Europe and America to isolate a country, and even more so a country as big as Russia. There are many more countries in the world."

Peskov said that if the United States imposed sanctions on Russia's energy exports then it would give a considerable jolt to energy markets.

British PM Boris Johnson File Picture

UK will speed up sanctions against Russians: Johnson

Britain will be able to move more quickly to sanction Russian businessmen over President Vladimir Putin's decision to invade Ukraine as a result of new legal measures which will be sent to parliament next week, Prime Minister Boris Johnson said.

Asked by foreign correspondents in London why Roman Abramovich, the highest-profile Russian businessman in Britain due to his ownership of Chelsea Football Club, had not been sanctioned, Johnson said the government had to move carefully.

"None of us want to live in a country where the state can take your house off you without a very high burden of proof and due process," he was quoted as saying in the interview conducted on Friday by Italy's La Repubblica and other newspapers.

"There's no point saying, yeah, we're going to go after him, and then you come up against the brick wall of lawyers. So we have to get it right. We're also trying not to just make this about one individual," Johnson added.

Britain has been criticised for not moving as quickly with sanctions against individuals as the European Union, the United States and Canada.

Johnson said amendments to Britain's economic crimes legislation due to be presented to parliament on Monday would help the government act with more speed.

"Top line of what our package on Monday will do is that the measures that you have against individual oligarchs in Europe will essentially allow us to catch them too," he said.

Britain on Thursday sanctioned two more Russians - industrialist Alisher Usmanov and former deputy prime minister Igor Shuvalov.

Abramovich said on Wednesday he would sell Chelsea Football Club and promised to donate money from the sale to help victims of the war in Ukraine.