Ukraine's Crimea attacks seen as key to counter-offensive against Russia

This week saw spectacular Ukrainian attacks on the Crimean Peninsula, hitting Russian warships and missiles.

Estimates of the damage done ran into billions of pounds and raised the question: is Ukraine getting ready to retake Crimea, which Russia annexed in 2014?

Crimea is a Russian fortress, so it is important not to get carried away.

"The strategy has two main goals," says Oleksandr Musiienko, from Kyiv's Centre for Military and Legal Studies.