You're listening to the Global News Podcast from the BBC World Service.

Hello, I'm Oliver Conway.

We're recording this at 13 hours GMT on Thursday, the 30th of March.

Brazil's former president, Gia Bullsen-Arru, returns home after months of self-imposed exile.

An American reporter is arrested in Russia accused of spying, prompting concern in the US.

And how a blood test could spare cancer patients the need for chemotherapy.

Also in the podcast?

Two generations have lived without the threat of nuclear war.

But this period is over. Will Putin press the nuclear button?

A Russian Nobel Peace Prize winner ponders the unthinkable.

And the first address to the German Parliament by a British monarch.

After three months in self-imposed exile in the United States,

the far-right ex-president of Brazil has returned home, with the potential to cause trouble for his successor.

Gia Bullsen-Arru left Brazil shortly before the swearing in of Louis Inacio Lula de Silva,

who narrowly beat him in the election last year.

Bullsen-Arru supporters were waiting at the airport in the capital-Brasilia,

draped in flags and chanting songs against President Lula.

Gia Bullsen-Arru, the most powerful candidate for the election.

Despite the loud reception from his supporters, Mr. Bullsen-Arru could face numerous legal challenges,

including whether he incited the rioters who stormed government buildings just days after he left the country.

The BBC's Camilla Mota in Sao Paulo taught me more about Mr. Bullsen-Arru's return.

Even though the security plans made by local authorities expressly said there shouldn't be

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