Profile

There is every sign this weekend that Russia's proxy war with Ukraine could become a full-blown conflict between states.The crisis now coming to a head has been in the making ever since Ukraine declared its independence from Moscow in the summer of 1990.Edward Stourton profiles the Ukrainian leader, Petro Poroshenko, who must now face the challenge of war - and who came of age and flourished during his country's first turbulent two and a half decades as a modern independent nation.Producer: Bob Howard.

Sir Nicholas Macpherson, largely unknown outside Whitehall, has become a key figure in the Scottish independence debate. And as head of the Treasury since 2005, he's been at the centre of Britain's response to the global financial crisis. Chris Bowlby explains why he's so influential, and how his involvement in the Scottish debate is informed by personal links as well as policy considerations.

As Iraq's divisive Prime Minister Nouri al-Maliki steps down, hopes are now pinned on his likely successor, Haider al-Abadi to restore trust with the Kurdish and Sunni communities and fight off the advance of the self-styled Islamic State's jihadist fighters. But what do we know about him?Mary Ann Sieghart charts the rise of the doctor's son from Baghdad, who gained a doctorate in electrical engineering in the UK, leading to him forming a company servicing lifts for clients including the BBC. She talks to fellow Shiite Dawa Party members, a member of the Sunni opposition and a former US diplomat to ask whether Dr al-Abadi has the qualities to fix his country's problems.

Jo Fidgen explores the life and times of Karren Brady, successful in business, TV star in The Apprentice and now a rising political star in the Conservative party. How did she succeed in the male-dominated business of football, and where might her career now take her?Producer: Chris Bowlby Editor: Innes Bowen.

Becky Milligan profiles Poland's foreign minister, Radoslaw Sikorski, a one-time teenage rebel, Oxford networker, daring reporter - and now a key voice in the Ukraine crisis and an important force in European politics. Producer: Chris Bowlby.

The so-called "fake sheikh" - investigative journalist Mazher Mahmood - hit the headlines this week after singer Tulisa Contostavlos's drugs trial, which was triggered by one of his newspaper investigations, collapsed. The judge told the court he thought prosecution witness Mahmood had lied in giving evidence.Mahmood has long been a controversial figure. His investigations, many for News of the World, have exposed serious wrongdoing. But he is accused of provoking people to commit criminal acts, in pursuit of a lurid newspaper headline. Edward Stourton presents.Producer: Smita Patel.

After this week's cabinet reshuffle Mark Coles profiles Nicky Morgan. Who exactly is the new education secretary? Producer: Smita Patel.

Elizabeth Butler-Sloss has been chosen this week to lead a major enquiry into abuse allegations. But the choice has proved controversial, with claims that she is too close to the establishment. A specialist in family law who became a high-ranking judge, she's been involved in many important decisions. Mary-Ann Sieghart looks at her life and career.Producer: Chris Bowlby.

Speculation abounded this week as to whether Elizabeth Warren hopes to be the Democratic candidate in the next US election.Elizabeth Warren has had a rapid rise to prominence since her election as Senator for Massachusetts in 2012. Her interrogation of key figures from the banking sector during the financial crisis earned her nicknames such as the 'Sheriff of Wall Street' and the 'Matriarch of Mayhem'.On Profile this week Chris Bowlby looks at the life and character of the woman who is said to make many Wall Street executives shiver.Producer: Charlotte Pritchard.

London barrister Amal Alamuddin has become engaged to one of the world's most elusive bachelors, Hollywood A-lister George Clooney. But she is an impressive figure in her own right. As a high-flying human rights lawyer she has defended the likes of Julian Assange of Wikileaks, former Ukrainian president Yulia Tymoshenko and the former head of Libyan intelligence Abdallah Al Senussi. She has also been an adviser to Kofi Annan of the UN on Syria and to the UN tribunal on the assassination of Lebanese prime minister Rafik Hariri. Mark Coles talks to those who know her well.Produced by Rebecca Kesby and Arlene Gregorius.