15 years ago, 23-year-old Norwegian student Martina Vic Magnuson was killed in an apartment near Mayfair.

23-year-old Martinevic Magnuson was found partially buried in the basement.

Before being questioned, the only suspect in the case had fled the UK to Yemen.

I made a promise to Martina's family to find out what happened.

Murder in Mayfair.

Part of the documentary, find it wherever you get your BBC podcast.

Welcome to Hard Talk on the BBC World Service with me, Stephen Sacker.

My guest today had a successful career as a diplomat and foreign policy analyst, which culminated in her

appointment as Austria's foreign minister in 2017. But if there's any one thing Karen Knaisel

will be remembered for, it is the fact that she danced a waltz with Vladimir Putin, who was a special

guest at her wedding in 2018. That dance and the deep

curtsy she gave the Russian president have come to symbolize a relationship between Austria's

political elite and Moscow, which many politicians and observers in the rest of Europe find

troubling. Ms. Knaisal never hid her friendly relations with

Moscow during her 18-month tenure as foreign minister, but the all-out Russian invasion of Ukraine in

February last year has prompted much closer scrutiny of Vienna's ties to the Putin regime.

Ms. Knaisisel herself was appointed to the

board of the Russian state-owned energy giant Rosnevd after leaving the foreign ministry. She quit

that post amid fierce criticism some three months after Putin's all-out assault on Ukraine began.

Since then, there's been much speculation in the Austrian

media and inside the Austrian Parliament about just how much influence, covert as well as overt,

Moscow wields in Vienna. Ms. Knaissel says she was forced to leave her home country after a series of

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