Mossad has not claimed anything. Numbers produced by some troll from a fictional local paper on the internet and claiming its from Mossad is not evidence of anything. According to the troll, Russia has lost only 18k troops, if that was the case they would not have conscripted and mobilised 300,000 men from their civilian lives last year.
The fact you have bought this hook, line and sinker shows its not me that lacks comprehension and critical thinking its you!
The 300k mobilised are only being deployed in numbers now. This is not a secret. That is why there is lots of activity all along the front now and Russia are pushing and probing all along the line. Ukraine armed forces are stretched and weakened. That is what the 300,000 were for. They didn't go straight to the front lines. They were training ready the big push now happening. How do you think that suddenly Ukraine's lines are breaking? Russian losses are easily a magnitude lower than Ukraine armed forces. Every other metric points to this. The equipment losses claimed are given credibility by the admitted number of donated equipment from NATO countries. If Ukraine haven't had those losses of equipment, then it needs to be explained where the initial equipment and additional weapons and equipment has gone, because they are still desperate for equipment. They have self evidently lost, at least, the numbers of equipment listed.
The acknowledged fact of artillery attrition rates, up to 10 to 1 in Russia's favour.
The waves of conscription in Ukraine. Utterly desperate for men and sending 18 year olds and 60 years old untrained conscripts to the front as fodder.
The above are all acknowledged numbers. How on earth given these huge imbalances do you imagine that attrition rates favour Ukraine?