Relatively close Capital City Pairs compared to Country Centroids

Let D1 be the distance between 2 capital cities. Let D2 be the distance between the 2 corresponding country centroids (the geographical centers of the countries). For which pairs of capital cities is D1/D2 smallest?
Data from Portland State University (https://www.pdx.edu/econ/country-geography-data), for missing countries from CIA (https://www.cia.gov/library/publications/the-world-factbook/fields/2011.html)
The Country of Capital A comes before the Country of Capital B in alphabetical order
Quiz by scambigol
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Last updated: November 7, 2015
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First submittedNovember 7, 2015
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D1 / D2
Capital City A
Capital City B
0.008
Kinshasa
Brazzaville
0.045
Rome
Vatican City
0.127
Tallinn
Helsinki
0.130
Vienna
Bratislava
0.134
Maputo
Mbabane
0.169
Minsk
Moscow
0.182
Moscow
Kiev
0.195
Vilnius
Moscow
0.216
Riga
Moscow
0.229
Buenos Aires
Montevideo
D1 / D2
Capital City A
Capital City B
0.232
Tallinn
Moscow
0.255
Warsaw
Moscow
0.257
Chisinau
Moscow
0.261
Maputo
Pretoria
0.264
Helsinki
Moscow
0.304
Beirut
Damascus
0.313
Ouagadougou
Niamey
0.316
Bucharest
Moscow
0.316
Moscow
Stockholm
0.319
Budapest
Moscow
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