After the Cold War, NATO moved very quickly to incorporate the eastern side of Europe, and Ukraine has been aiming to join NATO despite political chaos. It has caused security instability in Russia. As a result, President Putin has invaded Ukraine by leveraging Russian people’s sense of loss but is currently experiencing strategic limitations. The international order changes are expected amid concerns over the prolonged Ukraine crisis: the reorganization of the World War II and post-Cold War order, Russia's isolation, arms build-up in countries, global tendency of conservative and right-leaning, the confrontation between democracy and authoritarian camps, intensifying U.S.-China strategic rivalry, and fluctuating NPT system. Such changes can also have a direct or indirect impact on the Korean Peninsula.