To/from China there are many ferry routes from East coast cities all heading to Icheon (most popular are to/from Dalian, Dandong, Qingdao and Tanggu/Tianjin for Beijing.
If you have decided these are some of the countries you want to visit and need more planning information then you are strongly recommended to complement what you find here with a planning guide. If you are set on going and need a guidebook or reading material please see a list of recommended guides/books here (go on have a look! Plus shopping through the site is a big thank you (if you have been helped out); to see why click here. Some good, though quite expensive nightlife in Taipei.
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Despite being a island, international connections are easy: To/from Russia, Zarubino (near Vladivostok, the last stop on the Trans-Siberian), there are twice-weekly ferries to Sokcho.
It's around 18hours by boat and for this reason many take one of the regular flights.
There are also several tunnels would-be invading North Koreans mined that you can go down in.