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

I'm Janet Gilliland, 13 hours GMT on Tuesday, 19 September. These are our main stories.

Azerbaijan launches a military operation in the disputed territory of Nagorno-Karabakh.

India and Canada each expel a diplomat in an escalating row over the murder of a Sikh

separatist leader. Ukraine attempts to send a ship loaded with grain across the Black Sea,

despite the collapse of a safe passage deal with Russia.

Also in this podcast, how much longer will X, the rebranded version of Twitter,

remain free for those who don't want to pay?

The single most important reason that we're moving to having a small monthly payment

for the use of the X system is the only way I can think of to combat vast armies of bites.

We'll get reaction from users.

Armenia and Azerbaijan have already fought two wars over the disputed territory of Nagorno-Karabakh

in the three decades since the end of the Soviet Union. Now with reports of large-scale

shelling and continuous shooting, there are fears of a possible third conflict.

Azerbaijan announced it was launching what it calls an anti-terror operation in Nagorno-Karabakh.

It said it was a response to land mine explosions that killed six people which is blaming on Armenia.

In footage posted online by a journalist in a territory's regional capital, Stepanakert,

the sound of gunfire can be heard.

Nagorno-Karabakh is internationally recognized as part of Azerbaijan but most of the people

who live in the region are ethnically Armenian. Our correspondent in the region, Rehan Dmitry,

...