The Second Korean War will be a multinational conflict and to make things easier I will explain the factions for the readers here.

THE COALITION FORCE

Also called by media as simply "Coalition" the command structure is based on US-South Korea Combined Forces Command. Member states of this "coalition of the willing" include bulk of NATO members and major Asia-Pacific states:

a. Combat role:

1. United States of America

2. Canada

3. Republic of Korea (South Korea)

4. Australia

5. New Zealand

6. Japan

7. Great Britain

8. France

9. Germany

10. Italy

11. Spain

12. Portugal 

13. Poland (including a Lithuanian battalion)

14. Hungary

15. Philippines

16. Singapore

17. India

18. Indonesia

19. Malaysia

20. Czech Republic

21. Slovakia

22. Thailand

23. Greece

24. Bulgaria

25. Belgium

26. Netherlands

27. Romania

28. Finland (including an Estonian battalion)

b. Medical support only:  

1. Denmark

2. Sweden

3. Colombia

4. Israel

5. Taiwan

6. Brazil

7. Turkey

8. Latvia

 c. Other support:

1. Israel (military equipment and intelligence support)

2. Russia (military equipment and associated support to several friendly nations in the coalition, in this case, India, Malaysia, and Indonesia)    

3. South Africa (military equipment)

4. Brazil (military equipment)

5. Turkey (military equipment)

6. Saudi Arabia (political support)

7. Jordan (political support)

8. Egypt (political support)

9. Vietnam (political support)

RESISTANCE AXIS

Also mostly coined by media and often shortened as "Axis", the name based on the original Axis of Resistance, an anti-Western and anti-Israel alliance consist of Iran, Syria, and Lebanese militant group Hezbollah, all have friendly relations to North Korea.

Member states:

 a. Combat role:

1. Democratic People's Republic of Korea (North Korea)

2. Iran

3. China (initially intervene by unmarked combat aircraft and equipment, later open, independent intervention but still be counted as an Axis member)

4. Hezbollah

5. Venezuela

6. Cuba

b. Other participants:

1. Mercenaries paid by North Korea or Iran

2. Hamas (political support)

3. Syria (individual volunteers under Iranian command)

4. International Revolutionary Battalions (paramilitary armed group consist of far-left foreign fighters sympathetic towards North Korean cause, modeled after International Freedom Battalion in Rojava during the Syrian Civil War)

5. Russia (military equipment to Iran, Cuba, and Venezuela)