Some 2,000 NATO troops from the US, Britain and Poland are conducting an airborne operation as part of the biggest exercise performed in Poland since the 1989 end of communism and amid concerns over Russia.
The troops are to parachute Tuesday near the central city of Torun, where they are to secure a bridge on the Vistula River, as part of Polish-led exercise that involves some 31,000 troops.
Russia considers NATO troops' presence close to its border as a security threat. President Vladimir Putin's spokesman Dmitry Peskov said Tuesday in Moscow that the military exercise in Poland "does not contribute to the atmosphere of trust and security on the continent."
The Polish command of the exercise says the operation is transparent and international observers have been invited.