As Russia’s brutal war with Ukraine enters its fourth month, Edward Stourton asks who Russia's allies and friends are and looks at the nation's influence overseas.

While President Putin has made no secret of his belief that Ukraine should be part of a “greater Russia”, what is less apparent is how far Russia’s influence is spreading in other parts of the world.

These include sub-Saharan Africa, Latin America and the Middle East. With the West having left a vacuum in parts of Africa, President Putin has been able to offer military help in unstable countries such as Mali and the Central African Republic.

This follows Russia's intervention in Syria's civil war on the side of Bashar Al-Assad's government, with implications for the wider geopolitics of the region.

And in Latin America, Russia is accused of using soft power tactics through its media channels to polarise society and spread anti-US and anti-Western propaganda.

Edward Stourton asks to what extent this shows that Russia is trying to rebuild the old Soviet-US spheres of influence of the Cold War.

Producer: Caroline Bayley

In the wake of the greatest crisis to hit Europe since the Second World War, former Moscow correspondent Tim Whewell examines the president, people and processes that led to that momentous decision, and others like it.

Interviewees include investigative journalists Catherine Belton and Andrei Soldatov, and former NATO Secretary General George Robertson.

Producer: Nathan Gower

As tax rises hit pay packets next month is this an end to traditional Conservative low tax policy? The UK government has so far defied calls from across the political spectrum to shelve the planned 1.25 per cent increase in National Insurance, despite millions of households grappling with a rising cost of living at a time of great economic uncertainty as war rages in Ukraine. A greater proportion of the nation’s income will go to the taxman than at any point since the 1950s. Yet Brexit was billed by some as the UK’s chance to go it alone and create its own economic model, a “Singapore on Thames” – a low tax, light touch economy to attract outside investment. Instead, corporation tax is to increase from 19 percent to 25 per cent by 2023, while a new £12 billion annual levy to fund the NHS and social care comes in from April, initially in the form of higher national insurance payments. Prime Minister Boris Johnson has broken his election manifesto pledge not to raise such taxes to meet, he argues, the cost of supporting the economy through the pandemic. His chancellor hopes this will permit future tax cuts. But with policy priorities such as levelling up and a transition to net zero, and the realities of an ageing population, BBC Economics Correspondent Dharshini David asks whether we're seeing a fundamental shift in traditional Conservative low tax philosophy and whether that's a temporary choice - or an unavoidable permanent reorientation?

Producer: Caroline Bayley

Is a world without violence possible? Violence blights the lives of countless individuals each year. The Crime Survey of England and Wales suggests there were 1.2 million incidents of violent crime in the year ending March 2020.

Chris Naylor asks if there's a better way to deliver public services. Many of these were designed nearly a century ago to address the challenges of that time; from cradle to grave, offering help and support during times of need - just enough to get you back on your feet. But as we approach the quarter-way mark in the 21st century, our context today is radically different to that of 100 years ago. Dig a little deeper and some of the other assumptions that underpinned Beveridge’s vision of a welfare state no longer hold either: full employment; economic and fiscal growth; the presumption of unpaid domestic care (then done by women) and of affordable housing. Little wonder that services designed to respond to momentary problems in a person or household life can’t cope with the tsunami of demand that comes when those problems last for decades. And if our public services can’t cope with collective demand, the worry is this is contributing to a collapse in the trust we place in our public institutions and therefore in our politics too. As the years go by, as trust declines, so the problems get harder and harder to resolve.

Producer: Jim Frank

How can the planning system adapt so we can build new homes without alienating voters? Barrister and author Hashi Mohamed investigates, focussing on the system in England. The government has pledged to build 300,000 new homes a year by the mid-2020s to ease the country’s housing crisis and increase home ownership. But wide-ranging planning reforms to make it easier to achieve were shelved following the Conservatives’ shock defeat in the Chesham and Amersham by-election last year. So is it possible to create a politically acceptable planning system in this country? Deadlock between local communities and big developers is commonplace, with planning policies taking years to realise through a local government system that lacks vital resources and expertise. And what has to change for enough new homes to be built? Hashi Mohamed asks how the planning system, and the way we live and build, needs to adapt.

Probing the results of a major study into our unequal society. Faisal Islam, BBC Economics Editor, talks to two leading experts on inequality, who have together been working for several years on a research project for the Institute for Fiscal Studies. He asks Paul Johnson, IFS Director, and Nobel laureate Sir Angus Deaton what the findings reveal about the UK now, and how these issues can be addressed.

What do we owe future generations? Everyone who is alive, has rights. And governments have obligations to their citizens. But what about people who are not yet born? Should their interests be taken into account - even though they don’t yet exist? David Edmonds draws upon the thinking of the late philosopher Derek Parfit to address this vexing question, which has consequences for real-world policy now in areas such as climate change.

Can scientists develop a vaccine which can combat the coronavirus and all its variants? There have been three lethal outbreaks caused by coronaviruses this century: SARS in 2002, MERS in 2012 and now SarsCov2. Scientists predict we will eventually encounter SarsCov3. That’s why the race is on to develop a universal vaccine to combat the coronaviruses and variants we know about, and the ones we have yet to confront. But attempts to create a universal vaccine for viruses such as influenza and HIV have been going on for decades - without success.

Before 2020, proposals to create a vaccine against coronaviruses were not thought important enough to pursue since many just cause the common cold. Now that we understand their real threat, can scientists succeed in creating a vaccine to fight this large family of viruses,?

Produced and presented by Sandra Kanthal

Finding things out during the pandemic has been hit and miss: there’ve been miracles, and there’s been junk. What matters is not just what we think we know about how to intervene to improve human health, but how we think we know it. Methods can be inspired, flawed, or both. Michael Blastland tells the short and still-changing story of how science has been trying to get better at finding things out.

Contributions from:

Professor Sir Angus Deaton, Eisenhower Professor of Economics and International Affairs Emeritus at the Princeton School of Public and International Affairs and the Economics Department at Princeton University.

Producer: Ben Carter