I'm not sure we can call this "a lie". It may simply have been miscalculated. RU seems to be far more competent in defense they anyone wildly assumed.
ATM, it looks like RU has really done a textbook perfect defense in both tactics and doctrine. Only time will tell the weaknesses and if UKR can exploit them.
If the lines stalemate into next year, I believe it will then be up to Putin. Will he take the out that's available to him, or will he continue to believe he can succeed in gaining more territory?
I think you are rather wrong to talk about a stalemate. In June I posted several summaries of podcasts of German speaking military experts. They expected that the current type of action by the Ukraine would last way into August, because the Ukraine would have to degrade Russian troops and defensive positions.
Max and you are spoiled from wars in Kuwait and Iraq, where #1 Armies US and UK attacked a #3 Army and defense lines that were improvised and I think overimpressed. Even the US army would have a serious hard time, to cross mile deep and hundreds of miles long mine fields under constant arty fire.
Since Korea the US has not been in a serious war like this. Atacams, atacams, they do not clear miles of mines, neither do F16, they would be shot down like any SU or Migs. Clusters could help a lot with the mine fields, but in the end it is dirty old fashioned infantry which clears the mines and then takes the trenches, one by one.
That will take time, is slow, very dangerous and costly.
Luhansk and Dumbars, Doneskt, they bind Russian troops and can rather easily be supplied directly from Russia, across the border. To Regain the South the Ukraine has to soften the defenses of the South up and break through them, one by one. Mind you the Ukraine has only used 20% of its trained Reserve for the current operation.
Mind you even " the mighty US and UK air force " needed around 100 days, 3 month and some, with absolute air superiority, to break down the Iraqi defenses.
You guys expect that the Ukraine can do that over night, without absolute air superiority.
Sorry guys that is rather foolish.
Even the " all mighty US " could not do that.
The only thing the Ukraine needs now is ammo, which is coming and battlefield air defense and more anti air manpads.