Theresa May said the government is conducting a review of visas issued to wealthy foreign nationals as part of the UK’s response to Russia’s suspected involvement in the nerve agent attack in Salisbury.

Answering questions about the government’s stance on Russia, Ms May told the Commons Liaison Committee that Britain's interior minister was reviewing investor visas.

However, she insisted the checks on possible loopholes were not specifically focused on Russia.

"I think it is right that we look generally to see whether this is a part of our visa regime which is being used properly," she said.

Britain has ordered the expulsion of 23 Russian diplomats and has said it will consider other measures following the 4 March poisoning of former Russian spy Sergei Skripal and his daughter with what London says was a Soviet-era nerve agent.

May said 25 countries have now moved to expel Russian diplomats and she also noted NATO's decision to expel seven diplomats from Russia's mission to the alliance.

"I welcome the international support that we have garnered," she said. "This isn't just a matter of the UK position and working with the UK. I think it is the national security interests of the countries concerned."

The international reaction “has demonstrated to the Kremlin that we will not tolerate their attempts to flout international law, undermine our values or threaten our security”, she said.

Countries join UK expelling Russian diplomats over spy poisoning Show all 24 1 /24 Countries join UK expelling Russian diplomats over spy poisoning Countries join UK expelling Russian diplomats over spy poisoning United States Donald Trump has expelled 60 Russian diplomats from the US and closed the consulate in response to the Sergei Skripal spy poisoning. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Great Britain Prime Minister Theresa May confirmed Britain would be expelling 23 Russian diplomats. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Ukraine Ukrainian president Petro Poroshenko has expelled 13 Russian diplomats. Getty Countries join UK expelling Russian diplomats over spy poisoning Germany Germany's Chancellor Angela Merkel has expelled 4 Russian diplomats. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning France France's President Emmanuel Macron has also expelled 4 Russian diplomats. Reuters Countries join UK expelling Russian diplomats over spy poisoning Poland Poland's President Andrzej Duda has expelled 4 Russian diplomats. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Lithuania President of Lithuania Dalia Grybauskaite has expelled 3 Russian diplomats. Getty Countries join UK expelling Russian diplomats over spy poisoning Czech Republic Czech Republic President Milos Zeman has also expelled 3 Russian diplomats. AFP Countries join UK expelling Russian diplomats over spy poisoning Netherlands Netherlands Prime minister Mark Rutte has expelled 2 Russian diplomats. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Latvia Prime Minister of Latvia Maris Kucinskis has expelled 1 Russian diplomat. Getty Countries join UK expelling Russian diplomats over spy poisoning Estonia Estonia's Prime Minister Juri Ratas has expelled 1 Russian diplomat. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Croatia Croatia President Kolinda Grabar-Kitarovic has expelled 1 Russian diplomat. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Italy Italian President Sergio Mattarella has expelled 2 Russian diplomats. Getty Countries join UK expelling Russian diplomats over spy poisoning Canada Canadian Prime Minister Justin Trudeau has expelled 4 Russian diplomats. Getty Countries join UK expelling Russian diplomats over spy poisoning Finland Finland's President Sauli Niinisto has expelled 1 Russian diplomat. Reuters Countries join UK expelling Russian diplomats over spy poisoning Denmark Danish Prime Minister Lars Lokke Rasmussen has expelled 2 Russian diplomats. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Romania Romania's President Klaus Werner Iohannis has expelled 1 Russian diplomat. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Norway Norwegian Prime Minister Erna Solberg has expelled 1 Russian diplomat. REUTERS Countries join UK expelling Russian diplomats over spy poisoning Spain Spanish Prime Minister Mariano Rajoy has expelled 2 Russian diplomats. Getty Countries join UK expelling Russian diplomats over spy poisoning Sweden Sweden's Prime Minister Stefan Lofven has expelled 1 Russian diplomat. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Albania Albanian President Ilir Meta has expelled 2 Russian diplomats. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Australia Australian Prime Minister Malcolm Turnbull has expelled 2 Russian diplomats. Getty Countries join UK expelling Russian diplomats over spy poisoning Macedonia Macedonia President Gjorge Ivanov has expelled 1 Russian diplomat. AFP/Getty Countries join UK expelling Russian diplomats over spy poisoning Hungary President of Hungary Janos Ader has expelled 1 Russian diplomat. AFP/Getty

She added: “It is also important to note that our partners are not only taking these measures out of solidarity with the UK, but also because they recognise the threat that these Russian networks pose to the security of their own countries and the pattern of Russian aggression which has affected us all.”

Despite frosty relations between the two nations, Ms May sent a letter of condolence to Russian president Vladimir Putin after the deaths of 64 people in a shopping centre fire in Siberia.