TOAW III - eventually you run into a problem

So, I'm eight turns in to my invasion of South Korea.

 So, the forces of Kim il-Sung have run a considerable way into South Korea, but have now run into problems.

Firstly, the Americans are starting to arrive in numbers and have managed to halt my advance to a certain extent, throwing me back in others.

Secondly, I lack decent air coverage.

Thirdly, with the main railway line to the west of the country broken and only one lot of rail engineers, I can't bring massive lots of reinforcements down and my supplies are naturally effected.

Finally, that's a dangerous looking weak bit of my line to the east.

So, I guess this - or slightly further back - is going to be my temporary stop line.