A few dozen elite U.S troops and equipment were seen landing Sunday in southeastern Poland near the border with Ukraine, following President Joe Biden’s orders to deploy 1,700 soldiers there amid fears of a Russian invasion of Ukraine.

Hundreds more infantry troops of the 82nd Airborne Division are still expected to arrive at the Rzeszow-Jasionka airport, 90 kilometers (56 miles) from Poland’s border with Ukraine. A U.S. Air Force Boeing C-17 Globemaster plane brought a few dozen troops and vehicles.

Their commander is Maj. Gen. Christopher Donahue, who on Aug. 30 was the last American soldier to leave Afghanistan.

“Our national contribution here in Poland shows our solidarity with all of our allies here in Europe and, obviously, during this period of uncertainty, we know that we are stronger together,” Donahue said at the airport.

In Warsaw, Polish Defense Minister Mariusz Blaszczak hailed the deployment, saying that “deterrence and solidarity are the best response to Moscow’s aggressive policy, to the aggressive attempt at reconstructing the Russian empire.”

Russia has amassed some 100,000 troops on the borders of Ukraine, some for joint military exercises in Belarus, but insists it has no intentions of invading Ukraine.

A collective response by NATO members is “the best response to a threat, the only method of assuring security to Poland and to other NATO countries on the alliance’s eastern flank,” Blaszczak said.