What was a prime motivation for russia's colonial expansion in the late nineteenth and early twentieth centuries?

access to warm-water ports.

Explanation:

A warm-water port is a port where the water does not freeze in winter since they are available yearly.they are used to improve the geopolitical or economic interest and due to this  Russia needed a warm water port to have a well-rounded economy like China or America.

can you list the answers so i can answer the question