Relatively close Capital City Pairs compared to Country Centroids: non-bordering Countries only

Let D1 be the distance between 2 capital cities of non-bordering countries. 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: December 14, 2015
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First submittedDecember 14, 2015
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D1 / D2
Capital City A
Capital City B
0.127
Tallinn
Helsinki
0.257
Chisinau
Moscow
0.316
Bucharest
Moscow
0.316
Moscow
Stockholm
0.319
Budapest
Moscow
0.320
Berlin
Moscow
0.325
Vienna
Moscow
0.335
Moscow
Belgrade
0.336
Copenhagen
Moscow
0.340
Kuala Lumpur
Singapore
D1 / D2
Capital City A
Capital City B
0.340
Prague
Moscow
0.341
Moscow
Bratislava
0.344
Tripoli
Valletta
0.355
Sofia
Moscow
0.356
Zagreb
Moscow
0.357
Pristina
Moscow
0.362
Sarajevo
Moscow
0.364
Skopje
Moscow
0.369
Moscow
Ljubljana
0.372
Copenhagen
Oslo
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