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Option 1: Greece is a UN member country. This means that Greece is a sovereign state recognized by the United Nations and has been admitted as a member of the organization.
Option 2: Taiwan is not a UN member country. This means that Taiwan is not recognized as a separate sovereign state by the United Nations. The government of the People`s Republic of China claims Taiwan as part of its territory.
Option 3: Portugal is a UN member country. This means that Portugal is a sovereign state recognized by the United Nations and has been admitted as a member of the organization.
Option 4: Australia is a UN member country. This means that Australia is a sovereign state recognized by the United Nations and has been admitted as a member of the organization.
Therefore, the correct answer is option 2, Taiwan, as it is not a UN member country.