The latest incursion, which Ukraine’s military said included five armored personnel carriers, was at least the third movement of troops and weapons from Russia across the southeast part of the border this week, further blunting the momentum Ukrainian forces have made in weakening the insurgents in their redoubts of Donetsk and Luhansk farther north. Evidence of a possible turn was seen in the panicky retreat of Ukrainian soldiers on Tuesday from a force they said had come over the Russian border.
Russia, which has denied it is helping the insurgents, did not acknowledge the military movements. But the Russians have signaled that they would not countenance a defeat of an insurgency in the heavily Russian eastern part of Ukraine, which would amount to a significant domestic political setback for President Vladimir V. Putin of Russia in his increasingly fractious relationship with the United States and its European allies.
“Russia is clearly trying to put its finger on the scale to tip things back in favor of its proxies,” said a senior American official who spoke on the condition of anonymity because he was discussing intelligence reports. “Artillery barrages and other Russian military actions have taken their toll on the Ukrainian military.”
The Russian military movements carried the potential to poison any hope that a halt to the five-month-old conflict was any closer, one day after the presidents of both countries, at a meeting in Belarus, professed their desire for a solution. Russia’s behavior also raised the possibility of punitive new Western economic sanctions as a reprisal.
Andriy Lysenko, a spokesman for the Ukrainian military in Kiev, said the Russian armored column entered the town of Amvrosiyivka, south of Donetsk, expanding what Western and Ukrainian officials have described as one of the main fronts in a multipronged counteroffensive directed by Russia. This week, Ukraine accused Russia of sending an armored column toward the coastal city of Mariupol, far from the fighting around Luhansk and Donetsk, with the aim of diverting Ukrainian forces to deal with that new threat.
The Obama administration accused Russia of lying about its intentions, while European officials angrily demanded answers from the Kremlin. Chancellor Angela Merkel of Germany, who perhaps has the most cordial relationship with Mr. Putin, telephoned him on Wednesday to request an explanation, her office said.
Evidence that Russia was seeking to change the course of the conflict was abundant this week in the small southeast border town of Novoazovsk, where Ukrainian forces beat a nervous retreat on Tuesday, under attack from what fleeing soldiers described as columns of tanks, artillery and combat troops coming across the border.
Exhausted, filthy and dismayed, some Ukrainian soldiers staggering out of Novoazovsk for safer territory said they were cannon fodder for the attacking forces. As they spoke, tank shells whistled in from the east and exploded nearby.
Some of the Ukrainian soldiers appeared unwilling to fight. The commander of their unit, part of the Ninth Brigade from Vinnytsia, in western Ukraine, barked at the men to turn around, to no effect. “All right,” the commander said. “Anybody who refuses to fight, sit apart from the others.” Eleven men did, while the others returned to the city.
Some troops were in full retreat: A city busload of them careened past on the highway headed west, and purple curtains flapped through windows shot out by gunfire.
More fighting and shelling punctuated the area around the town on Wednesday, although it was unclear whether the assailants were Russian forces or members of the Donetsk People’s Republic, the name the separatists have given themselves.
The Obama administration, which has imposed increasingly punitive economic sanctions on Russia because of the Ukraine crisis, has asserted over the past week that the Russians had moved artillery, air-defense systems and armor to help the separatists in Donetsk and Luhansk.
“These incursions indicate a Russian-directed counteroffensive is likely underway,” Jen Psaki, the State Department spokeswoman, said Wednesday. At the department’s daily briefing in Washington, Ms. Psaki also criticized what she called the Russian government’s “unwillingness to tell the truth” that its military had sent soldiers as deep as 30 miles inside Ukraine territory.
Ms. Psaki apparently was referring to videos of captured Russian soldiers, distributed by the Ukrainian government on Tuesday, that directly challenged Mr. Putin’s assertions that Russia is a mere bystander in the conflict. The videos were publicized just as Mr. Putin was meeting with his Ukraine counterpart, Petro O. Poroshenko, in Belarus.
Russian forces have been trying to help the separatists break the siege of Luhansk and have been fighting to open a corridor to Donetsk from the Russian border, Western officials say.
To the south, Russia has been backing a separatist push toward Mariupol, a major port on the Sea of Azov, according to Western and Ukrainian officials. The Russian aim, one Western official said, may possibly be to seize an outlet to the sea in the event that Russia tries to establish a separatist enclave in eastern Ukraine.
Some Western officials fear the move might even be a step in what they suspect is a broader Russian strategy to carve out a land link to Crimea, the strategic Ukrainian peninsula that Russia annexed in March, setting off Moscow’s worst crisis with the West since the Cold War.
The Russian military’s use of artillery from within Ukraine is of special concern to Western military officials, who say Russian artillery has already been used to shell Ukrainian forces near Luhansk. And along with the antiaircraft systems operated by separatists or Russian forces inside Ukraine, the artillery has the potential to alter the balance of power in the struggle for control of eastern Ukraine.
The separatists have asserted that they are using captured Ukrainian equipment. But American officials say they are confident that the artillery in the Krasnodon area of Ukraine is Russia’s since Ukrainian forces have not penetrated that deeply into that separatist-controlled region. American officials also say the separatists have no experience in using such weaponry.
The United States has photographs that show the Russian artillery moved into Ukraine, American officials say. One photo dated last Thursday, shown to a New York Times reporter, shows Russian military units moving self-propelled artillery into Ukraine. Another photo, dated Saturday, shows the artillery in firing positions in Ukraine.
Advanced air defenses, including systems not known to be in the Ukrainian arsenal, have also been used to blunt the Ukrainian military’s air power, American officials say. In addition, they said, the Russian military routinely flies drones over Ukraine and shares the intelligence with the separatists.
In Novoazovsk, at least, there was no doubt among the retreating Ukrainians that their assailants were coming from Russia.
On the highway in Novoazovsk on Tuesday, Sgt. Ihor Sharapov, a soldier with the Ukrainian border patrol unit, said he had seen tanks drive across the border, although they were marked with flags of the Donetsk People’s Republic. Others suggested the flags were a ruse.
“I tell you they are Russians, but this is what proof I have,” said Sgt. Aleksei Panko, holding up his thumb and index finger to form a zero. Sergeant Panko estimated that about 60 armored vehicles crossed near Novoazovsk. “This is what happened: They crossed the border, took up positions and started shooting.”
The Ukrainian Vinnytsia brigade met the cross-border advance over the six miles of countryside separating Novoazovsk from the Russian border, but later retreated to the western edge of town along the Rostov-Mariupol highway, where soldiers were collapsed in exhaustion on the roadside. “This is now a war with Russia,” Sergeant Panko said.
The counteroffensive that Ukrainian officers said was at least in part staged across the border from Russia pushed the Ukrainian Army off a 75-mile-long highway from Donetsk south to the Azov Sea.
On Wednesday, it amounted to a no-man’s land of empty villages, roads crisscrossed by armored vehicle treads, felled trees and grass fires burning out of control, and panoramas of sunflowers and corn rotting.
Ukraine's Security Service said Tuesday that 10 Russian soldiers had been detained in the Donetsk region of eastern Ukraine, amid simmering tensions over the conflict between Ukrainian forces and pro-Russian rebels.
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