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As part of our conversations on the Ukraine-Russia crisis, we hear how Ukrainian civilians are getting military training to prepare for a possible Russian invasion. We bring together three women – one of them a sniper – in Kyiv to share their experiences.

We explain what happens after Justice Stephen Breyer retires from the US Supreme Court, and how President Biden will pick a successor.

The Kurdish-led militia, the Syrian Democratic Forces, say as many as 90 Islamic State militants at a jail in north-east Syria have still not surrendered despite a week of fighting. We speak to journalist in the city of Hasaka.

We answer your questions about Covid-19 with the help of Dr Emma Hodcroft, molecular epidemiologist at the University of Bern in Switzerland.

We hear from an Australian student who first discovered an unknown spinning object in the Milky Way that scientists claim is unlike anything seen before.

(Photo: Nastya, 21, a medic of the Ukrainian armed forces, stands next to a military ambulance near the line of separation from Russian-backed rebels outside a village of Pisky in Donetsk Region, Ukraine January 26, 2022. Credit: Maksim Levin/Reuters)