MOSCOW, (Reuters) – Satellite images published by a private U.S. firm on Sunday show details of military maneuvers at Belarus’ border with Ukraine. This was ahead of drills scheduled by Minsk and Moscow that NATO claims will be the largest Belarusian deployment since the Cold War.

Russia and Belarus announced that they would hold joint exercises, Union Resolve 2022 from February 10-20. These will be used to train for repelling an attack on the southern borders of their alliance. Russia also provided details about its warplanes and missiles.

These planned and new exercises and deployments take place during tensions high between Russia, the West and Russia over Russia’s massive troop buildup near Ukraine’s border. While Western nations accuse Russia of planning to invade Ukraine, Moscow insists that it does not have such plans.

Images from Maxar Technologies, a U.S. company (NYSE:), showed three sites in Belarus where military units with multiple rocket launchers, missiles and attack planes were stationed.

Reuters was unable to independently confirm the images.

Russian defense ministry didn’t immediately respond to a request for comment. On Sunday, the Belarusian military did not return calls.

Maxar Technologies stated that it captured images of military equipment near Yelsk (Rechitsa) and Luninets (February 4. The Ukrainian border is approximately 50 km (30 miles) away from all locations.

Satellite imagery showed Maxar Technologies’ 15 Su-25 Ground Attack aircrafts, S-400 Air Defense System at Luninets airportfield and multiple rocket launchers and missiles near Yelsk.

Russian defense ministry stated on Saturday it sent S-400 missile system and Su-25 aircraft to participate in the drills. Russian Defense Minister Sergei Shoigu visited the firing range at western Belarus ahead of the exercise.

Last week, NATO Secretary General Jens Stoltenberg called Russia’s manoeuvres in Belarus the largest Russian deployment since the Cold War. He also said that Iskander missiles could have been part of the operation.