WARSAW — Poland's foreign minister says his country is concerned about recent Russian military maneuvers near its border and he has expressed his worries in a letter to NATO.

Foreign Minister Radek Sikorski said in a radio interview on Thursday that he sent the letter to NATO Secretary-General Anders Fogh Rasmussen setting out Poland's concerns and asking that the alliance take the matter into account.

He declined to divulge the exact contents of the letter or say what steps he wants NATO to take.

About 12,500 Russian and Belarussian service members took part in the exercise in Russia's westernmost Kaliningrad region in late September.