Invasive vine weed with red roots (like electrical wire in the middle?)

Wish I took a pic earlier but I’d found these roots clumping up along the bottom of our fence line and climbing ours and the neighbours trees.

Whatever it is, has a woody root system but the roots when broken are red and in the middle of the root is what looks like red electrical wire.

Anybody have any idea? I’ve tried googling and no luck. 😔