Tree DD reorder same levels only

I have a tree with multiple levels, and each level has different types of nodes, e.g.:

- Territory1

- - Country 1

- - - City 1

- - - City 2

- - Country 2

- - - City 3

- - - City 4

I want to enable reordering using DD, but only within each level. For example, dragging City1 should only work within Country1. Dragging Country1 should only work under Territory1.

Likewise, I would like to enable drop from another tree only into a specific level, e.g. dragging a city into the tree should allow it to drop only under a country node.

Is this possible?