What?The problem is, that would mean Putin knows he has 10 years to take the Ukraine unopposed.
It means exactly the opposite.
What it means is that Russia and the West would have to compete for Ukraine peacefully for 10 years. Both will play all the games they can get away with, of course, and try to get "friendly" people in positions of power. But war will be off the table for that time period.
It's like the Iran deal. The deal was keeping Iran from getting nukes for however long the agreement held.
Hawks don't like deals like that.