South Korea threatened to send weapons and resources to Ukraine in response to its longtime foe, North Korea, escalating support for Russia's invasion.
If it goes ahead, it could prove a powerful ally.
After an emergency National Security Council meeting this week, top South Korean officials condemned North Korea for sending troops to Russia.
Their mission hasn't been made explicit, but Ukraine has said they're there to join Russia's invasion.
Officials also briefed news outlets that Seoul could send weapons to Ukraine as part of a series of phased countermeasures.