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1.
United Kingdom and Ireland
Northern Ireland, part of the UK, borders the Republic of Ireland
3.
France and Brazil
French Guyana, bordering Brazil, is part of France
4.
Poland and Russia
The Kaliningrad Oblast is an excalve of Russia that borders Poland
5.
Vietnam and Thailand
Both border Laos and Cambodia
6.
Tajikistan and Kazakhstan
8.
Luxembourg and Netherlands
9.
Croatia and Montenegro
The Dubrovnik-Neretva exclave of croatia borders Montenegro
10.
Angola and Republic of Congo
Cabinda is an exclave of Angola that borders the Congo
11.
Saudi Arabia and Egypt
Almost, at the very end of the Gulf of Aqaba
12.
Greece and Turkey
The Thrace region, part of Turkey border Greece
13.
Sri Lanka and India
Not anymore because the Adam bridge is submerged
15.
Azerbaijan and Turkey
Nakhchivan Autonomous Republic on Azerbaijan shares a border with Turkey on the Aras River