Which one of the following countries shares the territorial boundary w

Which one of the following countries shares the territorial boundary with both Russia and Ukraine ?

Estonia
Latvia
Belarus
Poland
This question was previously asked in
UPSC CDS-2 – 2024
Looking at the geography of Eastern Europe, Belarus shares a land border with both Russia to the north and east, and Ukraine to the south. While Poland also borders Ukraine and Russia (via the Kaliningrad exclave), Belarus shares extensive direct land borders with both contiguous Russia and Ukraine.
Belarus is strategically located between Russia and Ukraine, sharing borders with both.
Other countries bordering Ukraine include Poland, Slovakia, Hungary, Romania, and Moldova. Other countries bordering the main territory of Russia include Norway, Finland, Estonia, Latvia, Lithuania, Poland (via Kaliningrad), Belarus, Georgia, Azerbaijan, Kazakhstan, China, Mongolia, and North Korea.