Question: Who served as both the Prime minister and Foreign minister in the 1980's to the sovereign country consisting of six major islands and over 900 smaller islands in Oceania?

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Ben Jones (Grenada): Ben Joseph Jones (5 August 1924 – 10 February 2005) was a Grenadian politician.  He was a lawyer before being elected to Parliament as a member of the New National Party in 1984.  In 1984 he began serving as foreign minister in the government of his party's leader, Herbert Blaize.  When Blaize died in December 1989, Jones became prime minister of Grenada.  He served until March 1990, when his party lost elections.  He also gave up his position as foreign minister at that time, but was reappointed later that year.  Though his party was out of power, Jones continued serving as foreign minister until 1991.

Yerzhan Ashikbayev: Yerzhan Ashikbayev ( Ержан Ашықбаев, born in Almaty) is the Deputy Foreign Minister of the Republic of Kazakhstan.  He was appointed in 2013.  Previously, he served as Deputy Head of the Prime Minister's office, Head of Foreign Policy at the office of the President, and Head of the Foreign Minister's Chancellery.  In his role as deputy foreign minister, Mr. Ashikbayev is the Kazakhstan's diplomatic point person matters of the United Nations and the Americas.  Mr. Ashikbayev is a lead communicator on the Strategic Partnership Dialogue with the United States.

Ezekiel Alebua: Ezekiel Alebua PC (born 1947) was the third Prime Minister of the Solomon Islands from 1 December 1986 until 28 March 1989.  He served as Foreign Minister from 1981 to 1982.  Alebua was the premier of Guadalcanal province from 1998 to 2003, and antagonised some people in that area for not supporting moves to declare that province independent.

Sam Abal: Samuel Tei "Sam" Abal (born 26 June 1958) is a Papua New Guinean politician.  Abal, who previously served as Foreign Minister from August 2007 to December 2010, became the Deputy Prime Minister of the country in a cabinet reshuffle by Michael Somare on 7 December 2010.  He further became acting Prime Minister of Papua New Guinea on 13 December 2010, when Prime Minister Somare stepped down from office to face a tribunal regarding allegations of financial mismanagement.  His tenure as acting Prime Minister ended on 2 August 2011, when Peter O'Neill won a parliamentary vote to be appointed as Prime Minister.

Swedish governmental line of succession: The Swedish constitution of 1974 allows the Prime Minister of Sweden to appoint one of the Ministers in the cabinet as Deputy Prime Minister ("biträdande statsminister", also unofficially known as "vice statsminister", "Vice Prime Minister"), in case the Prime Minister for some reason is prevented from performing his or her duties.  However, if a Deputy Prime Minister has not been appointed, the Minister in the cabinet who has served the longest time (and if there are several with equal experience the one who is oldest) takes over as head of government.  Note that the person acting as Prime Minister does not do so on a permanent basis: if a Prime Minister dies, resigns or loses a vote of confidence in the Riksdag, the Speaker of the Riksdag will then confer with the parties of the Riksdag and propose a new Prime Minister, who must be tolerated by a majority of the Riksdag.  If the Prime Minister has resigned or lost a vote of confidence, he or she will remain the head of a government "ad interim" until the new Prime Minister assumes his or her office.  The only case where the governmental line of succession becomes relevant is when the Prime Minister dies (upon which the person next in the line of succession serves as the head of a government "ad interim") or when the Prime Minister is on leave or for any other reason incapable of serving, but still remains in office.  This might be compared to the Presidential line of succession in the United States, where the person next in line assumes the Presidency throughout the remainder of the term if the President dies, resigns or is impeached.

Valdis Birkavs: Valdis Birkavs (born July 28, 1942) is a Latvian politician.  He was born in Riga.  Birkavs attended the University of Latvia, where he studied philosophy, sociology, law, psychology and mathematical logic.  He was first elected to the Latvian parliament in 1990 and helped to found the Latvian Way party.  After Latvian Way won the 1993 parliamentary election, Birkavs became the prime minister, leading a coalition government of Latvian Way and the Latvian Farmers' Union.  He resigned after the Farmer's Union left the government in the summer of 1994.  He then became the deputy prime minister and foreign minister in the next government.  He remained the foreign minister for five years under four different prime ministers, eventually resigning in 1999.  In the presidential elections of 1999 (Latvia's president is chosen by the Parliament), he was nominated as a candidate and received second place.  He was then appointed as minister of justice, and served in that position until 2000.

Sao Hkun Hkio: Sao Hkun Hkio (Burmese: စဝ်ခွန်ချို , ] ; 19 August 1912 – 1990) was a Burmese political figure and diplomat who served as acting Foreign Minister of Myanmar in 1948, 4th Foreign Minister of Myanmar (1950-1958, & 1960-1962) as well as Deputy Prime Minister of Burma in the era of 1st Prime Minister of Burma U Nu.  He was known for being the longest serving Foreign Minister of Myanmar.  He additionally served as the last Saopha of Möngmit from 1936 to 1952.  His elder brother-in-law, Sao San Tun was the Saopha of Mongpawn who was assassinated along with General Aung San, father of modern-day Burma who served as 5th Premier of British Burma Crown Colony from 26 September 1946 to 19 July 1947.

Solomon Islands: Solomon Islands is a sovereign country consisting of six major islands and over 900 smaller islands in Oceania lying to the east of Papua New Guinea and northwest of Vanuatu and covering a land area of 28400 km2 .  The country's capital, Honiara, is located on the island of Guadalcanal.  The country takes its name from the Solomon Islands archipelago, which is a collection of Melanesian islands that also includes the North Solomon Islands (part of Papua New Guinea), but excludes outlying islands, such as Rennell and Bellona, and the Santa Cruz Islands.

Australia: Australia ( , , ), officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands.  It is the largest country in Oceania and the world's sixth-largest country by total area.  The neighbouring countries are Papua New Guinea, Indonesia and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east.  Australia's capital is Canberra, and its largest urban area is Sydney.

Ali Mroudjaé: Ali Mroudjae (born 1939) is a former Prime Minister and foreign minister of the Comoros.  Mroudjae became foreign minister after the coup by Bob Denard brought Ahmed Abdallah to power in 1978.  He continued in that position until 8 February 1982, when he became prime minister.  He left the office of Prime Minister on 31 December 1984.  He was part of the Comorian Union for Progress.

Supporting paragraphs: Ezekiel Alebua Solomon Islands
Answer: Ezekiel Alebua