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The attempted murder of Sergei Skripal , using a deadly nerve agent, risked the lives of police and passersby, and broke international laws on chemical weapons and human rights.

Chemical experts say the nerve agent is military grade, developed by Russia. This echoes the murder of Alexander Litvinenko by Russia with nuclear poison. Instead of supporting the probe, Russian Ministers sneer, joke and threaten.

And police are now investigating the murder of another Russian in London .

Oligarchs who run Russia want to fool us with propaganda, intimidate us with power or seduce us with wealth so we stay silent on their crimes.

We need robust criminal probes, backed by international cooperation via the UN and the Office for the Prohibition of Chemical Weapons.

Visa and border security against those involved with the Kremlin or Russian security services must be tightened up. But we also have to target their money. We should hit investments of those involved in human rights abuses.

The Government has agreed to our Magnitsky law proposals – but we should go further.

This is so serious and people should not behave like Twitter trolls (or Russian bots).

No one is talking about military action – this is about criminal probes, financial sanctions, expulsions, diplomatic pressure and cooperation.

Inaccurate rhetoric about war does not help.