Indeed they are. Let me outline the threats like I promised.
-Soviet Tanks: The Soviet tanks are heavy-metal and slow tanks with very strong armor and massive plasma generators. They're currently bombarding our main crew and the frontlining NAC troops, making "death from above" VERY literal. If you can get up close, they won't be much of a problem - there are hatches able to be opened on the front and top of the tank, and characters with super strength can rip the cannon half of the tank from the tread half. From far away, though, they're devastating.
-Soviet Mechs: Basically what Michael has. The mechs are equipped with plasma-resistant armor, powerful legs and left arm powered by hydraulics, and a right arm that can shift towards plasma cutter and plasma cannon. AT-AT them to throw them down, then try to get something inside the cockpit.
-Soviet Cars: Military vehicles holding infantry troops, usually comes with a roof-mounted gatling gun. The weakest of the vehicles here, total the car or take out the men inside.
-Soviet Bikes: Fast-moving roadkillers, the individual units are armored enough - as seen with Keda - but the bikes themselves have heavy guns and even droppable proximity mines. If you can take out the driver, you might be able to get one of these bad boys for yourself...
-Soviet Infantry: Armored soldiers similar to the ones Master Chief and Doomslayer fought. Armed with the same rifles the Hunter now has as well as plasma grenades, EMPs, flashbangs and handguns. Their armor is resistant to plasma, so regular bullets do nothing. However, they're still ordinary humans...
-Soviet Commander: The only one I WON'T be revealing right off the bat, the commander is the biggest threat that needs to be dealt with. This is probably going to be an Erza battle.