This feature lets you show all players from one country that are playing abroad. If you for example want to look up Russian players in North America, you select "Russia" in nation dropdown above and "North America" below.

ABROAD SKATERS IN North America
Player Team GP G A TP PIM +/-   GP G A TP PIM +/-
ABROAD GOALIES IN North America
Player Team GP GAA SVS%   GP GAA SVS%