Russia is building an army base near its border with Ukraine, the latest in a chain of new military sites along what the Kremlin sees as its frontline in a growing confrontation with NATO.
While there have been no clashes between the former Cold War rivals, Russia is building up forces on its western frontiers at a time when the NATO alliance is staging major military exercises and increasing deployments on its eastern flank.
A Reuters reporter who visited the Russian town of Klintsy, about 50 km (30 miles) from Ukraine, saw a makeshift army camp, large numbers of newly-arrived servicemen and military vehicles.
Two soldiers in camouflage gear who were manning a checkpoint in a forest turned the reporter away, saying they were guarding a "special military site".
A road near the camp was blocked off by antitank obstacles and road spikes.
On Monday Klintsy, normally a sleepy town, was a hive of military activity. The Reuters reporter saw about a dozen tents and the same number of military vehicles in a temporary camp in a clearing in a forest where the troops will be billeted until their permanent base is ready.
Last year, Reuters also reported on construction of two other bases further to the south on Russia's border with Ukraine.
The defense ministry has not acknowledged the deployment of troops to Klintsy, which usually serves as a stop for truck drivers traveling between Russia, Ukraine and Belarus.
However, a town council official said Klintsy had been chosen as the site of a newly-formed division, and that so far about 240 soldiers had arrived.
When completed, the base will be the latest component in a build-up of forces along a line running from the Baltic Sea in the north to the Black Sea in the south.
On the western side of the line, NATO has been rotating troops and equipment in greater numbers to members states that were part of the Soviet-led Warsaw Pact during the Cold War.
Russia has pulled out of the treaty on Conventional Forces in Europe, a post-Cold War pact that limits the deployment of troops in Europe, so it is free to move extra troops and hardware to its western border.
To the east, Russia is building up its own forces, saying it needs to protect itself from NATO's eastward advance.
Each side says it is only responding to steps taken by the other, but the build-up risks locking NATO and Russia into a spiral of measure and counter-measure from which it will be difficult to escape.