This is the Global News podcast from the BBC World Service.

I'm Janet Jalil and at 13 hours GMT on Tuesday the 26th of November, these are our main stories.

Protesters demanding the release of Pakistan's jailed former Prime Minister Imran Khan

have battled with security forces to reach the centre of the capital, Islamabad.

Ukraine says it's been hit by the biggest ever drone strike by Russia.

A former officer in Russia's elite nuclear forces who's fled the country has spoken to the BBC.

The troops are there to either repel or carry out a nuclear strike.

There's a very strict selection process.

There are constant checks and lie detector tests.

Also in this podcast, why Demure has been named the Word of the Year by an online dictionary.

We begin in the Pakistani capital Islamabad,

where security forces have clashed with thousands of demonstrators demanding the release of the

jailed former Prime Minister Imran Khan.

His supporters who have travelled from all over Pakistan

to take part in the protest broke through a ring of shipping containers that have been used

to lock down the city since the weekend. Police in riot gear fired tear gas and stun grenades

to try to disperse the crowds near the parliament building.

This man said the protesters were intent on staying.

We are here only at the call of Imran Khan.

He told us to come here, not for him, but for ours and our country's sake.

That's the reason we are here.

We will stay here until Khan himself is here with us and tells us what to do next. As we record this podcast, there are reports that several people have been killed,

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