Admiral Sir Tony Radakin made the assessment in an interview with the BBC on Sunday, Polish state news agency PAP reported.
Referring to his recent visit to Kyiv, the British armed forces chief said that Ukraine’s army was “absolutely” confident it would win the war.
‘Russia lost 30% of its land combat effectiveness’
“They plan to restore the whole of their territory in terms of Ukraine, and they see a Russia that is struggling, a Russia that we assess has lost more than 30% of its land combat effectiveness,” the admiral said in an interview with BBC One’s Sunday Morning show.
‘50,000 Russian soldiers dead or injured’
Radakin went on to state: “What that actually means is 50,000 Russian soldiers that have either died or been injured in this conflict, nearly 1,700 Russian tanks destroyed, nearly 4,000 armoured fighting vehicles that belong to Russia destroyed.”
‘Russia is more diminished than it was in February’
The admiral noted that the Kremlin had aimed to take Ukraine's cities within the first 30 days of the invasion.
“Russia had the ambition to create fractures and to apply pressure to Nato,” he added. “This is Russia as a challenge to the world order.”
The UK armed forces chief stressed: “Russia is failing in all of those ambitions.”
“Russia is a more diminished nation than it was at the beginning of February,” Radakin concluded.
Sunday was day 144 of the Russian invasion of Ukraine.
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Source: PAP, bbc.co.uk, dailymail.co.uk