By Matthew Young The UK should “absolutely” be concerned about the threat of the Islamic State after the Moscow terror attack, it was claimed today. Chancellor Jeremy Hunt said European countries must “remain vigilant” after 137 were killed in an assault that suggests the jihadist group still maintains the capacity for major atrocities. Hunt described the loss of civilian life as a “tragedy” but condemned the Kremlin after it appeared to seek to link Ukraine, which Russia invaded two years ago, to the attack. “We have very little confidence in anything the Russian government says. We know that…