WASHINGTON Russia is preparing to send as many as 100,000 troops to the eastern edge of NATO territory at the end of the summer, one of the biggest steps yet in the military buildup undertaken by President Vladimir V. Putin and an exercise in intimidation that recalls the most ominous days of the Cold War.
The troops are conducting military maneuvers known as Zapad, Russian for west, in Belarus, the Baltic Sea, western Russia and the Russian enclave of Kaliningrad. The drills will feature a reconstituted armored force named for a storied Soviet military unit, the First Guards Tank Army. Its establishment represents the first time since the collapse of the Soviet Union that so much offensive power has been concentrated in a single command.
The military exercise, planned for many months, is not a reaction to sweeping new economic sanctions on Russia that Congress passed last week. So far, Russia has retaliated against the sanctions by forcing the expulsion of several hundred employees in American diplomatic posts in the country.
But the move is part of a larger effort by Mr. Putin to shore up Russias military prowess, and comes against the backdrop of an increasingly assertive Russia. Beyond Russias interference in the 2016 presidential election in support of the Trump campaign, which has seized attention in the United States, its military has in recent years deployed forces to Syria, seized Crimea and intervened in eastern Ukraine, rattled the Baltic States with snap exercises and buzzed NATO planes and ships.
Punishing sanctions by the United States and European allies that have isolated Russia further have done nothing to stop Mr. Putins saber-rattling, as illustrated by the long-scheduled Zapad exercise.
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Even more worrying, top American military officers say, is that the maneuvers could be used as a pretext to increase Russias military presence in Belarus, a central European nation that borders three critical NATO allies: Poland, Lithuania and Latvia.
The great concern is theyre not going to leave, and thats not paranoia, Gen. Tony Thomas, the head of the United States Special Operations Command, told a national security conference in Aspen, Colo., in July.
Peter B. Zwack, a retired one-star Army general who was the American defense attache in Moscow from 2012 to 2014, said: First and foremost, the messaging is, ˜Were watching you; were strong; weve learned a lot; dont mess with Russia.
Western military officials caution that the United States and Russia are not on the brink of war. But they expressed concern that the heightened Russian military activity could lead to unintended confrontations.
For this installment of the Zapad maneuvers, a Cold War relic revived in 1999 and held again in 2009 and 2013, Russia has requisitioned enough rail cars to carry 4,000 loads of tanks and other heavy equipment to and from Belarus.
The Russians already have about 1,000 air defense troops and communications personnel stationed in Belarus, and logistical teams are surveying training sites there. By mid- August, advance elements of the thousands of Russian Army, airborne and air defense troops that are to participate in the exercise are expected to arrive. The rest of the force is expected to reach Belarus by early September ahead of the Zapad exercises, scheduled for Sept. 14 to 20.
The United States is taking precautions, including sending 600 American paratroopers to NATOs three Baltic members for the duration of the Zapad exercise and delaying the rotation of a United States-led battle group in Poland.
Look, wll be ready; well be prepared, said Lt. Gen. Frederick B. Hodges, the head of United States Army forces in Europe. But were not going to be up on the parapets waiting for something to happen.
In 2014, Russias stealthy forays into eastern Ukraine and its rapid capture of Crimea were seen as skillful exercises in hybrid warfare, a combination of cyberwarfare, a powerful disinformation campaign and the use of highly trained special operation troops and local proxy forces.
But there is nothing subtle about the tank-heavy unit at the heart of the coming Zapad exercise.
The First Guards Tank Army, made up mainly of forces transferred from other units, including elite motorized and tank divisions near Moscow, has an extensive pedigree. The unit battled the Germans during World War II on the Eastern Front and eventually in Berlin before becoming part of the Soviet force that occupied Germany. In 1968, it participated in the invasion of Czechoslovakia to crush the Prague Spring.
After the end of the Cold War, the unit was withdrawn to Smolensk, near the border with Belarus, before being disbanded in 1998. But it was reconstituted by Mr. Putin to give the Russian military more offensive punch and present a visible demonstration of Russian power.
That name was chosen for a reason,said Philip M. Breedlove, a retired four-star Air Force general who served as NATO commander. It sends a very clear message to the Baltics and Poland.
That is more tanks than NATO has in active units deployed in the Baltic States, Poland and Germany put together, not including armor in storage that would be used by reinforcements sent from the United States, noted Phillip A. Karber, the president of the Potomac Foundation, who has studied Russian military operations in and around Ukraine.
There is only one reason you would create a Guards Tank Army, and that is as an offensive striking force, General Hodges said. This is not something for homeland security. That does not mean that they are automatically going to do it, but in terms of intimidation it is a means of putting pressure on allies.
Mr. Karber cautioned against exaggerating the First Guards Tank Armys capability, noting that not all of its units were fully manned and that some of the most modern tanks earmarked for it have not arrived.
But if fully deployed into Belarus, he said, it will be a powerful offensive formation and a way for the Russian military to rapidly project power westward, which is all the more important for Moscow. The collapse of the Soviet Union meant that Russian forces lost Belarus and Ukraine as buffers.
Just the presence of the First Guards Tank Army near the Polish border would put NATO on the horns of a dilemma, Mr. Karber said. Does NATO reinforce the Baltics or defend eastern Poland? NATO does not have enough forces to do both in a short period of time. It adds to the political pressure Russia can bring to bear to keep the Baltic nations and Poland in line.
The Russians have also announced that the First Guards Tank Army will be the first formation to receive the T-14 Armata tank, a new infantry fighting vehicle, as well as advanced air defense and electronic warfare equipment.
A more immediate concern, however, is whether Russia will use the Zapad exercise to keep Belarus in line. Belarus has long worked closely with Moscow, and its air defense units are integrated with Russias to the east. But with friction between the nations autocratic president, Aleksandr G. Lukashenko, and Mr. Putin have come reports that Belarus is reluctant to host more Russian forces permanently.
As part of the maneuvers, units of the First Guards Tank Army are expected to establish a forward command post in western Belarus, and to hold exercises in training areas near Brest, on the Polish border, and Grodno, near Poland and Lithuania.
Russian officials have told NATO that the maneuvers will be far smaller than Western officials are anticipating and will involve fewer than 13,000 troops. But NATO officials say the exercise is intended to test Russias contingency plans for a major conflict with the alliance and will also involve Russian civilian agencies.
We have every reason to believe that it may be substantially more troops participating than the official reported numbers, Jens Stoltenberg, NATOs secretary general, said in July.
Adding to the concern, the Russians have yet to agree that international observers can monitor the Zapad exercise. American officials have long said that monitoring is important, given the difficulty of Western intelligence in determining whether Russian military activity is merely an exercise or a preparation for an armed intervention.
The United States, in contrast, allowed Russian, Chinese and even North Korean observers to monitor a recent Army exercise, called Saber Guardian, in Romania, Hungary and Bulgaria.
At least two battalions of First Guards units, or some 3,000 armored troops, are expected to participate in the Belarus maneuvers. The total number of Russian troops, security personnel and civilian officials in the broader exercise is expected to range from 60,000 to as many as 100,000.
The question NATO officials are asking is whether all of the troops and equipment in Belarus will leave.
Said General Hodges, I am very interested in what goes in and what comes out.