It is very risky to move high valued assets like Patriot batteries close to the front line as in that case these assets are within the reach of low distance sur

It is very risky to move high valued assets like Patriot batteries close to the front line as in that case these assets are within the reach of low distance surveillance tools Russia has in abundance. Doing this resulted in loss of actual Patriot systems in Ukraine - these were spotted by Russian surveillance drones and then attacked using ballistic missiles. Ukraine could instead attack launch sites on Russian territory - it has been proven to be highly effective in Crimea - but Ukraine is not allowed to use Western ballistic missiles for that.