Hundreds of British people answered Ukraine’s urgent plea for military volunteers to help it fight back when Russian tanks rolled in.Some were novices, who travelled against UK government advice, while others took experience from the Britain’s armed forces.

The journalist Colin Freeman has got to know many of them during his work in Ukraine and is sharing the story of the war through their eyes, in detail, for the first time.

He tells Kate Gerbeau about his book “The Mad and The Brave – The Untold Story of Ukraine’s Foreign Legion”

Sitrep digs deep into homeland defence in the UK. A former National Security adviser lays out the potential threats we face and we ask how prepared are we for a wartime scenario? 

The Colonel in charge of engaging the Army with the public says the challenge has never been bigger .

And how do you persuade the public that defence matters? A former Lance Corporal, now an MP faces that very battle. 

War is changing and military strategy no longer delivers victory because of a “short war fallacy”. That warning comes from eminent defence historian Professor Sir Lawrence Freedman, who was part of the Iraq inquiry panel.

He tells Sitrep why he believes military strategists, and their political masters, need to change their mindset, while Professor Michael Clarke explains how the UK’s recent defence review stacks up against that thinking.

Air Chief Marshal Sir Rich Knighton has been confirmed as the new Chief of Defence Staff.  Sitrep assesses what he’ll bring to this newly beefed-up role leading the Armed Forces.

And Dr Victoria Taylor tells us why German reticence to share the history of the Luftwaffe means we may have failed, until now, to fully understand the Battle of Britain.

The history of the Battle of Britain has been written many times over the last 85 years, but almost always from a British perspective.

The award-winning aviation historian Dr Victoria Taylor believes that’s led to the Luftwaffe’s role being oversimplified, meaning we don’t truly understand what happened.

She talks to Sitrep editor James Hirst about her new book “Eagle Days”, which takes a fresh look at the story of wartime Germany’s air force to understand the psychology which drove its actions.

Researched through the letters and diaries of the men who served she tells us why this was not the David vs Goliath fight that is often simply portrayed, and why the idea that “they were just like us” is a troubling misunderstanding.

NATO countries have signed up hundreds of billions of pounds in extra defence spending by 2035, but no one has told us yet what it will be spent on.

But Mike explains how the UK’s part can already be seen in recent Strategic Defence Review.

From F-bombs to F-35s, and the viral ‘Daddy’ moment, there was a lot of political theatre at the NATO summit. But a former commander of the UK-led Allied Rapid Reaction Corps tells Sitrep why he’s sure that, behind the scenes, serious military figures have a firm grip on getting things done.

And Sian Grzeszczyk-Melbourne gives us an insider’s take from The Hague, including the importance of seating plans and President Trump turning the tables on a Ukrainian journalist.

The UK has around 100 square miles of sovereign territory in Cyprus, home to more than 3000 Defence personnel, and it is a lynchpin of British military operations around the world.

On the doorstep of the Middle East it’s used from everything from bombing missions, to intelligence gathering and decompression for troops returning from operations.

Sitrep talks to Colonel Vicky Reid about her key role as the UK Defence Adviser in Cyprus, responsible not only for helping deliver missions such as civilian evacuations, but also keeping everything running smoothly by maintaining the working relationship with the government of Cyprus

[This interview was recorded before the war between Israel and Iran, when extra RAF jets were deployed to Cypus]

RAF planes have been moved to the Middle East for ‘contingency support’, but what could those contingencies end up being?

Professor Michael Clarke maps out the British military presence in the region, which could come under threat from Iran in a worst-case scenario.

Lord Peter Ricketts, who led many a crisis meeting as National Security Adviser, explains how and why the UK is making military plans even as it calls for de-escalation.

And a former Deputy Commander of RAF Operations, Air Marshal Greg Bagwell, tells us how those British aircraft could be used, and in what situations that might happen.

The head of NATO issues his starkest warning yet about Russia’s readiness for war. We speak to Ed Arnold, a senior research fellow at the defence think-tank RUSI and a former infantry officer.

In Ukraine, drone warfare is reaching ever-more sophisticated levels. We look at how this single weapon is changing warfare with Dr. Ulrike Franke, a Senior Policy Fellow at the European Council on Foreign Relations.

And the Royal Navy’s Carrier Strike Group makes its way through the Red Sea – what next for this projection of UK military power?  We get the thoughts of Commodore Steve Prest who was the Commander Weapon Engineer on Britain’s other carrier, HMS Queen Elizabeth. He was also part of the top-level team that brought the QE out of build and into sea trials.

It’s the new defence masterplan for the next decade and beyond, but what does the Strategic Defence Review mean for the Armed Forces?

The lead military author of the review, General Sir Richard Barrons, joins a special live edition of Sitrep to explain the plan and answer your questions about how it should work.

Former Royal Navy Commander Tom Sharpe adds his insights to the discussion with Kate Gerbeau and Professor Michael Clarke.

The whole team will break down the big questions including the threats we face, how the job of the Armed Forces could change,  and when the PM’s target of warfighting readiness can be met.

As the Royal Navy unveils HMS Venturer to the public for the first time – we ask, what hope does the first Inspiration Class Frigate offer a surface fleet short on ships and sailors?

Sitrep’s reporter David Sivills-McCann has all the answers - he witnessed the new type 31 frigate rolling out of the build hall in Rosyth. The former second sea lord and Babcock chief executive of marine Sir Nick Hine says the Royal Navy will love her.

We’ll also look at the German Chancellor's announcement that restrictions are lifted on long range Western weapons supplied to Ukraine – and that his country will help them make their own. It’s been a contentious issue for well over a year now - both before and after ATACMs and Storm Shadows were supplied to Ukraine. Sitrep’s Ukraine reporter Simon Newton tells us how significant this move is.

And the story of the secret unit set up in World War 2, to deceive, mis-inform and, on occasion, come up with believable lies. Terry Stiastny's new book examines the people and the tactics used by the Political Warfare Executive whose job it was to broadcast fake news to the occupied countries in World War 2.