There is NOT a bilateral treaty between the United States and South Korea, however strong diplomatic and economic ties could be assumed to make this a moot point.
Every country has no extradition treaties with the.
No such treaty exists between UK-Japan. Japan has extradition treaties with two countries, USA and the Republic of Korea (in effect as of 2006).
Ukraine
Australia
Australia
Canada
Maybe IRAN!!
Taiwan.
I think most developed countries have treaties setup with all other countries. These treaties can be for business, bilateral ties, criminal extradition etc.
India maintains extradition treaties with about 30 other countries.
Rather than list the countries that DON'T have extradition treaties with Canada the link below will list all the countries that DO have extradition treaties with Canada.You may compare this list against all the other nations of the world and make your own list.See below link:
Extradition treaties.