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 the US has sent thousands of them.Javelin missiles are among the items that have been sent to Ukraine through a series of military assistance packages. In total, more than $3bn in military aid has been sent to Ukraine since Russia invaded on 24 February. The latest $800m (£612.5m) package, announced by President Joe Biden on Thursday, also includes heavy artillery, howitzers and tactical drones to be used on the flat plains in eastern Ukraine. Mr Biden also banned Russian-flagged ships from entering US ports. Other armaments sent so far 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?