Ukraine's armed forces are heavily outnumbered and outgunned by Russia's, but as Russia begins what may be a large-scale invasion, military experts say they would be capable of mounting significant resistance and inflicting heavy casualties.

Ukraine's army is also better trained and equipped than in 2014, when Russia captured the Crimea peninsula from Ukraine without a fight, and is widely seen as highly motivated to defend the country's heartland.

Here are some details of Ukraine's military...