It’s been a week of international disbelief at Russia's insistence in linking Ukraine to the Moscow concert hall shooting, despite all evidence pointing to the Islamic State group. We look at Putin's motive and also the threat posed by IS-K in Europe.

It was also a week where the French principle of secularism became a flashpoint again. A headteacher resigned after receiving death threats for ordering pupils to remove their headscarves. The government is suing a pupil for falsely alleging the teacher assaulted her. We assess President Emmanuel Macron's so-called ruthless approach to extremism.

Finally, it was a quiet week for royal trolls and conspiracy theorists, in light of the announcement that Catherine, Princess of Wales has cancer. King Charles III, who is also undergoing treatment, delivered a pre-recorded Easter message praising friendship in a time of need. We ask whether it's the job of the mainstream media to report on social media storms and teacup conspiracies at all.