Ukrainian Pavlo Lapshyn, who admitted murdering a grandfather from Birmingham and planting bombs near mosques in the West Midlands, has been sentenced at the Old Bailey to life in jail.
A judge told him: "You clearly hold extreme white supremacy views that are abhorrent to all right thinking people and have no place whatsoever in our multi-faith and multi-cultural society.
"You were intent on finding a Muslim to murder."
He will serve a minimum of 40 years.
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Tory Eurosceptic Jacob Rees-Mogg played down the significance of the deal struck by the Government to win over pro-EU rebels.
The Tanaiste issued the warning to the UK ahead of a visit to Dublin by European Commission President Jean-Claude Juncker.
Around 9,500 people gathered at the neolithic World Heritage Site to attend the overnight celebration of the longest day of the year.