MOSCOW (AP) — Separatist forces deployed more arms and manpower Wednesday to an emerging flashpoint in eastern Ukraine, undermining hopes for a new peace initiative taking shape.
Responding to the developments, Ukrainian President Petro Poroshenko cut short a visit to the economic summit in Davos, Switzerland, where he courted European support in the worsening crisis.
The events unfolded ahead of a meeting in Berlin of the foreign ministers of Ukraine, Russia, France and Germany aimed at laying the groundwork for a long-lasting settlement.
In advance of the talks, Russian Foreign Minister Sergey Lavrov proposed both sides in the conflict pull their heavy weapons back from a previously agreed-upon dividing line to help defuse hostilities. Lavrov's remarks were greeted with cautious approval by his Ukrainian counterpart, Pavlo Klimkin.
"Russia needs to confirm (peace deals) through deed not word," Klimkin said on his Twitter account.
While Lavrov urged measures to contain the unfolding unrest, he said nothing about the rebels surrendering territory they acquired in violation of a peace deal concluded in September in Minsk, Belarus. Ukraine says separatist forces that are backed by Russia have overstepped agreed-upon front-line boundaries between the warring sides by 500 square kilometers (190 square miles).
A fresh separatist advance is under way in an area northwest of Luhansk, the second-largest rebel-held city. The fighting is centered on two checkpoints along a strategic highway.
Ukraine's Defense Ministry said one of those positions, Checkpoint 31, had been abandoned but that operations were underway to retake it.
The separatist forces appear well-poised to take the upper hand, however.
An Associated Press reporter saw nine Gvozdika self-propelled howitzers and six anti-tank cannons moving near the town of Perevalsk around midday. A rebel militiaman with the convoy who declined to give his name said the armament was heading in the direction of Checkpoint 31.
Along the same road, the AP saw four Grad multiple rocket launchers accompanied by four trucks carrying ammunition and 15 pristine-looking tanks, also heading toward the checkpoint.
Ukraine and the West accuse Russia of providing material support to the separatists, which Moscow denies. The sheer amount of sophisticated heavy weaponry in the hands of the insurgents, however, is widely seen as overwhelming evidence of direct involvement by Russia.
Speaking during a visit to Kiev, U.S. Army Europe commander Lt. Gen. Ben Hodges said the quantity of Russian equipment being provided to separatists had doubled between the September cease-fire deal and December.
"It is very clear from the capabilities that the proxies (rebels) have used against Ukrainian security forces, the type of artillery, modern equipment, the amount of ammunition that has been used," Hodges said. "It is irrefutable that they are getting direct support from Russia."
Addressing the World Economic Forum in Davos, Poroshenko held up a piece of a bullet-riddled bus as evidence of shelling last week by Russian heavy artillery in his country. He says 9,000 Russian troops are occupying 7 percent of Ukrainian territory.
He said the metal came from a bus in the town of Volnovakha, where 13 people were killed by what he described as Russian shelling.
"For me this is a symbol, a symbol of the terroristic attack against my country," he said, comparing it to the downing of Malaysia Airlines Flight 17 over rebel-held eastern Ukraine last summer. He called it a "global problem," extending far beyond just Ukraine's borders.
The fighting in the Luhansk region follows intense clashes over the weekend for control of the airport on the fringes of the main rebel city, Donetsk. The terminal — once the pride of the city but now reduced to a burned-out shell — is of limited strategic value. Now, however, it has acquired symbolic value because of the Ukrainian forces' stand against waves of separatist attacks.
The fierce airport battle shattered the relative tranquility that had been in place since a new truce was reached in early December.
Shelling in and around Donetsk has abated since the weekend, although artillery strikes have continued to claim civilian casualties. A shell that fell in Donetsk's Kirov district Wednesday left two dead.
U.S. State Department spokeswoman Jen Psaki said there has been an increase in separatist violence, including rocket attacks on the Donetsk airport in recent days, and separatist seizures of more territory.
"We've also seen reports that Russia has moved two tactical battalions into Ukraine," she said in Washington. "We can confirm that Russia continues to move tanks, armored vehicles, trucks artillery pieces and other military equipment to deployment sites near the Russia-Ukraine border, which serve as staging points before transporting military equipment to pro-Russia separatists. That is something we're seeing."
Secretary of State John Kerry said the U.S. was concerned that the separatists were attacking the town of Debaltseve, about 70 kilometers (45 miles) east of Donetsk.
"This is a very blatant land grab and it is in direct contravention to the Minsk Agreement that they signed up to," Kerry said.
Lavrov said the continuing truce violations were rooted in the failure to abide by the line of contact between the two sides. He said Russian President Vladimir Putin had written to Poroshenko with a proposal to use the original boundary for the withdrawal of heavy weapons.
Under the September agreement, Ukrainian and separatist forces agreed to pull back their artillery by 30 kilometers (19 miles).
Poroshenko said a political dialogue must follow to help stabilize the situation and called for holding local elections in eastern Ukraine. Lavrov said Russia would welcome municipal elections there.
Ukraine is trying to cope with a resource-draining conflict while simultaneously fending off the prospect of total economic collapse.
International Monetary Fund head Christine Lagarde said Poroshenko asked the organization to replace Ukraine's current $17 billion bailout package with a new one.
"We will consult with the IMF executive board on the (Ukrainian) authorities' request," Lagarde said.
Chernov reported from Perevalsk, Ukraine. Peter Leonard in Kiev, Ukraine; John Heilprin in Davos, Switzerland; and Matthew Lee in Washington contributed to this report.
By VLADIMIR ISACHENKOV and MSTYSLAV CHERNOV (Associated Press)