LVIV, Ukraine (AP) — Russia widened its military offensive in Ukraine on Friday, striking airfields in the west and an industrial city in the east for the first time as a huge armored column long stalled outside Kyiv was on the move again, fanning out into nearby forests and towns.

The U.S. and its allies prepared to step up their efforts to isolate and sanction Russia by revoking its most favored trading status. But with the invasion now in its 16th day, Russia appeared to be trying to regroup and regain momentum, with expanded bombardment and tightening on cities already under attack, particularly the key port city of Mariupol, where tens of thousands were struggling to find food under an intense 10-day-old siege.

Russian President Vladimir Putin said there are “certain positive developments” in Russia-Ukraine talks — but did not offer details.

The Russian leader hosted Belarus President Alexander Lukashenko in Moscow for talks on Friday, telling him negotiations were “being held almost on a daily basis,” and that “there are certain positive developments, negotiators on our side reported to me.”

For his part, Ukrainian President Volodymyr Zelenskyy said Ukrainian forces had “reached a strategic turning point,” speaking in a video outside the presidential administration in Kyiv

“It’s impossible to say how many days we will still need to free our land, but it is possible to say that we will do it because ... we have reached a strategic turning point,” he said, He didn’t elaborate. He said authorities were working on 12 humanitarian corridors and trying to ensure food, medicine and basic goods to people across the country.

Western and Ukrainian officials have said Russian forces have struggled in the face of heavier-than-expected resistance and supply and morale problems. So far, they have made the most advances on cities in the south and east while stalling in the north and around Kyiv.

Friday’s strikes targeted the west, away from the main battlezones, where the Ukrainian air force has used bases to operate. Russian Defense Ministry spokesman Igor Konashenkov said Russia used high-precision long-range weapons Friday to put military airfields in Lutsk and Ivano-Frankivsk “out of action.” He did not provide details.

The Lutsk strikes killed four Ukrainian servicemen and wounded six, Lutsk Mayor Ihor Polishchuk said. In Ivano-Frankivsk, residents were ordered to shelters after an air raid alert, Mayor Ruslan Martsinkiv said.

In another potentially ominous movement, new satellite photos appeared to show the massive Russian convoy outside the Ukrainian capital had fanned out into nearby towns and forests.

Howitzers were towed into positions to open fire, and armored units were seen in towns near the the Antonov Airport north of the city, according to Maxar Technologies, the company that produced the images.

The 40-mile (64-kilometer) line of vehicles, tanks and artillery had massed outside Kyiv early last week. But its advance had appeared to stall amid reports of food and fuel shortages while Ukrainian troops also targeted it with anti-tank missiles.

The purpose of the new moves was unclear. Russia likely intends to eventually encircle the capital. But Nick Reynolds, a land warfare analyst at British defense think-tank Royal United Services Institute, said the move “looks like a defensive measure to allow the convoy to both better protect itself” and may indicate it can’t surround the city quickly.

“Therefore, by dispersing, they can better protect themselves in the areas where they do hold ground,” Reynolds said. The Russians seemed to be stalled near Kyiv and Kharkiv but making progress in other areas, and the Ukrainian military has “taken a battering” while Russia is increasing bombardments and regrouping its forces on the ground.

“It’s ugly already but it’s going to get worse,” he said.

The British Ministry of Defense said that after making “limited progress,” Russian forces were trying to “re-set and re-posture” their troops, gearing up for operations against Kyiv.

Moscow also indicated it plans to bring fighters from Syria into the conflict.

Russian President Vladimir Putin approved bringing in “volunteer” fighters and told his defense minister to help them “move to the combat zone.” Kremlin spokesman Dmitry Peskov confirmed the “volunteers” include fighters from Syria.

Defense Minister Sergei Shoigu said Russia knew of “more than 16,000 applications” from Middle East countries, many of them from people he said had helped Russia against the Islamic State group, according to a Kremlin transcript.

Since 2015, Russian forces have backed Syrian President Bashar Assad against various groups opposed to his rule, including Islamic State. Opposition activists in Syria have also reported Russian recruitment efforts for the Ukraine war. But they estimate the number of volunteers so far is in the hundreds or a few thousand.

On the sanctions front, revoking Russia’s “most favored nation” trade status by the U.S. and other nations would allow higher tariffs on some Russian imports. Western sanctions have already dealt a severe blow to Russia, causing the ruble to plunge, foreign businesses to flee and prices to rise sharply. Putin has insisted Russia can endure sanctions.

Meanwhile, the offensive on Ukrainian cities has expanded.

In Syria, Russia backed the government in imposing long, brutal sieges on opposition-held cities, wreaking heavy destruction on residential areas and causing widespread civilian casualties. That history, along with the ongoing siege of the Azov Sea port of Mariupol, has raised fears of similar bloodshed in Ukraine.

Russian airstrikes Friday targeted for the first time the eastern city of Dnipro, a major industrial hub and Ukraine’s fourth-largest city in a strategic position on the Dnieper River. Three strikes hit, killing at least one person, according to Ukrainian Interior Ministry adviser Anton Heraschenko.

In images of the strikes’ aftermath released by Ukraine’s state emergency agency, firefighters doused a flaming building and scattered ash fell on bloodied rubble. Smoke billowed over shattered concrete and collapsed sidings where buildings once stood.

The Ukrainian general staff said the attacks in the west and in Dnipro were launched because the Russians were “unable to succeed” on other fronts. It said Russian efforts remained concentrated around Kyiv and Mariupol, and that Russian forces were regrouping in the north and around the eastern cities of Sumy and Kharkiv.

Temperatures sank below freezing across most of Ukraine and were forecast to hit -13 degrees Celsius (8 Fahrenheit) in Kharkiv, which has come under heavy bombardment. Some 400 apartment buildings were cut off from heating supplies, and Kharkiv Mayor Ihor Terekhov appealed to remaining residents to descend into the subway system or other underground shelters where authorities and volunteers were distributing blankets and hot food.

A deadly strike on a maternity hospital in Mariupol this week sparked international outrage and charges of a possible war crime.

Mariupol residents said bombardment continued Friday. Konashenkov, the Russian Defense Ministry spokesman, said Russian-backed fighters have advanced up to 800 meters from Mariupol from the east, north and west, further squeezing the city which has the Azov Sea to its south. He said the advance was being conducted by fighters from the separatist-held Donetsk region, the standard Russian line for fighting in the east.

Ukrainian authorities are planning to send aid to Mariupol, home to some 430,000, Ukrainian Deputy Prime Minister Iryna Vereshchuk said in a video message.

Repeated previous attempts have failed as aid and rescue convoys were targeted by Russian shelling, even as residents have grown more desperate, scrounging for food and fuel.

More than 1,300 people have died in the siege, Vereshchuk said. “They want to destroy the people of Mariupol. They want to make them starve,” she added. “It’s a war crime.”

Some 2.5 million people have fled Ukraine since the invasion began, the International Organization for Migration said Friday. Millions more have been driven from their homes. Kyiv Mayor Vitali Klitschko said about 2 million people, half the metropolitan area’s population, have left the capital.

Associated Press journalists Felipe Dana and Andrew Drake in Kyiv, Ukraine, along with other reporters around the world contributed.

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