To mark the Russian invasion of Ukraine, a special edition on episodes from Ukrainian history.

In April 1986 a reactor exploded at the Chernobyl nuclear power plant in Soviet Ukraine. Sergii Mirnyi monitored radiation levels in the exclusion zone around the plant. How the international community - including both Russia and the USA - offered security "assurances" to Ukraine in return for giving up its share of the Soviet nuclear arsenal. A survivor's account of Ukraine's great famine in the 1930s, the Holodomor, when several million people died. The mass killing of Ukrainian Jews by Nazi Germany during World War Two, and how Artek, on the shores of the Black Sea in Crimea, became the Soviet Union's most popular holiday camp.

Photo: The Chernobyl plant shortly after the explosion in 1986 Credit: Getty Images

To celebrate International Women's Day, a special edition on five women who've made their mark on history. US feminist Gloria Steinem remembers founding Ms Magazine in 1972; Iranian lawyer Shirin Ebadi discusses the human rights campaigning which won her the Nobel Peace Prize; and a friend of Anna Akhmatova remembers the great Russian poet. Plus, a leading Italian feminist on the international movement in the 1970s which demanded women get paid for housework; and the Australian women who helped turn public opinion against the Vietnam War.

Picture: Gloria Steinem, centre, at the offices of Ms Magazine in New York circa 1974 (Credit: PL Gould/IMAGES/Getty Images)

How Vladimir Putin, a former KGB agent, rose to power and transformed Russia. We hear eyewitness accounts of Putin's war in Chechnya, his campaign against Russia's independent media, and the war in Georgia, which became a blueprint for the invasion of Ukraine. Plus the BBC's Russia specialist Lucy Ash tells us why Putin was shaped by his experience of the end of the Cold War, and we talk to Dr Katerina Tertytchnaya of UCL about Putin's popularity and a turning point in Russian popular protest.

Photo: A Russian soldier walks through the streets of the destroyed Chechen capital Grozny, February 25, 2000. (Photo by Oleg Nikishin/Getty Images)

In the 1990s, doctors in Berlin began a cutting-edge treatment programme that led to a patient being cured of HIV/AIDS. The so-called "Berlin patient" was Timothy Ray Brown: he was suffering from leukemia as well as HIV/AIDS, and was given a bone marrow transplant from a donor with a rare genetic mutation which killed off the HIV virus. We find more about Timothy Ray Brown's story and the latest research on an HIV cure.

Also, in a special edition on LGBT history, how Bollywood lesbian drama "Fire" raised awareness of LGBT issues in India; the trans film star who made headlines in Yugoslavia during a time of war; and the first couple in the world to celebrate a same-sex civil union.

PHOTO: Timothy Ray Brown in 2012 (Getty Images)

Former presidents and protestors recount two key moments in the history of the Ukraine crisis - from the historic meeting that ended the USSR to the dramatic anti-government protests in Ukraine in 2013-14. And the BBC's Lucy Ash explains how Russian-Ukrainian relations have evolved.

Photo: Kyiv, Ukraine - December 9th 2013. Anti-government protesters stand guard at one of the barricades defending Maidan Square against police. Credit: Etienne De Malglaive/Getty Images

How Kazakhstan's strongman president, Nursultan Nazarbayev, created a new capital, which would eventually be named after him; transformation in the UEA - the first Emirati female teacher in the 1960s; the murder of American journalist, Daniel Pearl; from 70 years ago, the passing of Britain’s King George VI; and a once-in-a-lifetime transit of Venus.

Picture: Kazakhstan's capital, Astana, since renamed Nur-Sultan (credit: Shutterstock)

In one of the most controversial episodes of 'The Troubles' in Northern Ireland, UK soldiers fired on unarmed Catholic protesters, killing 13 in January 1972. We look at why British troops were there, what happened on that day, and how it further polarised Protestant Unionist and Catholic Republican communities. Successive UK governments insisted the soldiers had returned fire in self defence, until a public inquiry reported in 2010 that the soldiers had in fact fired first - and at fleeing, unarmed, protesters. The then Prime Minister, David Cameron, apologised on behalf of the government. We'll speak to former BBC Northern Ireland Editor, Eimear O'Callaghan, who as a teenager kept a diary of life in sectarian Belfast in the 1970s, later published into a book, and who reported for years on the struggle for peace.

Photo: A British soldier grabs hold of a protester by the hair. (Credit: AFP/Getty Images)

In 2009, Boko Haram, a small Islamist group, launched an insurgency in the north eastern Nigerian city of Maiduguri. The conflict would eventually force hundreds of thousands from their homes, and leave tens of thousands dead. We hear a witness account of how the violence started. Plus, this past week Americans have been observing the Martin Luther King Jr. Day national holiday. The long campaign to have Dr King formally recognized in the US was led by his widow, Coretta Scott King. We hear from her daughter, Dr Bernice King, about the campaign. We dip into the BBC archive to bring you the story of the notorious Stanford Prison Experiment. Also, from the 1980s, a time when many wanted to get out of East Germany and into the West, the young woman who decided to go the other way and set up a new life in the East. And the Dutchman behind the first bike sharing scheme.

Photo: A suspected Boko Haram house in Maiduguri set ablaze by Nigerian security forces, 30th July 2009 (AFP/Getty Images)

The Indian independence campaigner, Subhas Chandra Bose, sided with Hitler's axis powers in World War Two to try to free his country from British rule. We'll hear from his great-niece about why she thinks that if he had lived he could have changed the course of India's history. We'll also hear from Dr Shruti Kapila of Cambridge University about why India's current government is celebrating Bose. Plus a nuclear scientist tells us about his role in a secret project to make safe vast swathes of nuclear-contaminated land in post-Soviet Kazakhstan - as well as preventing nuclear material from falling into the wrong hands. Also, the reckless actions which led to the sinking of the Costa Concordia cruise ship, the first woman to have silicone breast implants and Malick Sidibé, the Malian photographer whose work altered people's perceptions about 1960s Africa.

Photo: Subhas Chandra Bose giving a speech in Nazi Germany in 1942.

Mozambique’s struggle to end Portuguese colonial rule and the assassination of Eduardo Mondlane, we'll hear from his daughter Nyeleti Brooke Mondlane and Dr Eric Morier-Genoud from Queen's University Belfast. Also, the brainwashing of Albanian youth under Stalinist Enver Hoxha's leadership, the fight for democracy in Taiwan and the worst ever loss of life at sea - the sinking of the German military transport ship, Wilhelm Gustloff in World War Two. All that plus, from the archives, the life and work of the celebrated French author Marcel Proust 100 years after his death.

PHOTO: Eduardo Mondlane in 1966 (Getty Images)