What weapons will US give Ukraine - and how much will they help?

The burnt-up wreckage of a Russian tank lies in the dirt, while in an accompanying photo next to it, a Ukrainian soldier carries the armaments said to have caused the destruction.

The images posted to Twitter by the Ukrainian Armed Forces are labelled with a triumphant caption, declaring that this was the result of "hits from Javelins on [Russian] military equipment".

The Javelin, a shoulder-held anti-tank weapon that shoots heat-seeking rockets hurtling towards targets up to 4km (2.5 miles) away, can be controlled by a portable unit that doesn't look much different from a video game console - but can send a metre-long projectile straight through the side or top of an armoured tank.

The very presence of the American-made weapons "causes panic" among Russian troops, the Ukrainian military claims - and it is about to get 2,000 more of them.

Javelin missiles are among the items promised to Ukraine by the US in a new $800m (£608.3m) military assistance package announced by President Joe Biden on Wednesday.

Other armaments include drones that can be turned into flying bombs and anti-aircraft weapons that can shoot helicopters from the sky.

But will these shipments help Ukraine overcome Russia's more numerous - and better equipped - invasion force?