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As insurgents dig in near Russia, Ukraine sends in its tanks

Ukrainian troops moved to oust pro-Russian separatists who had overtaken an airfield and government buildings in Kramatorsk
Ukraine’s military targets pro-Russian separatists 02:01

IZYUM, Ukraine - Pro-Russian insurgents dug in Tuesday across eastern Ukraine, fortifying positions around seized buildings and erecting new barricades even as Ukrainian troops and tanks began to set up outside and roll into some eastern cities now controlled by armed men. The uptick in war-like posturing by all sides in the Ukrainian crisis has world leaders scrambling to find a solution.

In Kiev, Ukraine's acting president, Oleksandr Turchynov, announced an "anti-terrorist operation" for a second time Tuesday to root out the separatists, but it was unclear how that measure differed from the one announced Monday.

The central government claimed Tuesday morning that some of the separatists had already surrendered, but so far there's been little evidence of that, reports CBS News' Holly Williams.

An Associated Press reporter has heard heavy gunfire at an airport in eastern Ukraine after the government sent in army troops to retake control from pro-Russian militiamen.

The mayor of Kramatorsk said Ukrainian troops have now occupied the military airport and are blocking its entrance.

Much of the rest of the focus Tuesday was on the eastern city of Slovyansk, 100 miles from the Russian border, which has come under ever more secure control of the gunmen since it was taken over last weekend.

Pro-Russian activists guard a barricade outside the regional police building they seized in the eastern Ukrainian city of Slavyansk on April 15, 2014.  GENYA SAVILOV/AFP/Getty Images

An Associated Press reporter saw at least 14 armored personnel carriers with Ukrainian flags, one helicopter and military trucks parked 24 miles north of the city Tuesday. Other heavy military equipment appeared nearby, along with at least seven busloads of government troops in black military fatigues.

"We are awaiting the order to move on Sloyvansk," said one soldier, who gave only his first name, Taras.

Government troops at a checkpoint there, located outside the town of Izyum, searched vehicles driving by for weapons.

Despite fears of a possible imminent assault by Ukrainian troops, the city appeared calm. Roads into Slovyansk were dotted with militia checkpoints, at least one with a Russian flag. Another bore a sign "If we don't do it, nobody will."

Crisis in eastern Ukraine escalates 04:17
Still, the threat the Ukrainian military posed to the highly organized, pro-Russian insurgents was unclear. One video posted online late Monday showed a hapless Ukrainian tank stuck in the mud in a field reportedly outside Slovyansk. Residents chased it on foot, shouting "Who are you going to fire at?"

The insurgents, many of them armed, continued to occupy government, police and other administrative buildings in at least nine cities in the country's Russian-speaking east of the country, demanding broader autonomy and closer ties with Russia. The central government has so far been unable to rein in the insurgents, and many local security forces have switched to their side.

In the town of Horlivka, CBS News found that insurgents had barricaded themselves inside the police headquarters, and that many of the policemen once stationed there were now wearing small orange bands to indicate they had joined the opposition. The policemen who defected pointed out that the central government expected trouble there a while ago, and had confiscated their weapons before the trouble started.

A wave of sit-ins has hit Horlivka. Outside the police station, a sign pinned to a barricade of tires listed items required by protesters, including blankets, drinking water and tape to cover up windows smashed during the storming.

Anatoly Zhurov, a 53-year-old Horlivka resident, said the insurgents' goal was to resist the government in Kiev.

Ukraine's security services on Tuesday identified a man it says is a Russian foreign intelligence agent who is running the pro-Russian operations in Slovyansk. It named him as Igor Strelkov, and said he also coordinated Russian troops in Crimea during the seizure of military facilities there.

Russia itself still has tens of thousands of troops massed along Ukraine's eastern border. Western governments accuse Moscow of fueling the unrest in eastern Ukraine and worry that any bloodshed could be used as a pretext for a Russian invasion, in a repeat of events in Crimea a few weeks ago. Russia annexed the Crimean Peninsula after seizing it last month following the ouster of Ukraine's pro-Russian president in February.

In a phone call Monday, Russian President Vladimir Putin urged President Barack Obama to discourage the Ukrainian government from using force against protesters in the country's east. President Obama is coming under increasing pressure from inside Washington and in Europe to step up the U.S. response.

Meanwhile, the Interior Ministry said a police station in the eastern city of Kramatorsk that had been seized by pro-Russian gunmen was "liberated" Tuesday, but a small airport nearby was still controlled by the militia.

Turchynov, speaking to the parliament in Kiev, gave few details of the "anti-terrorist operation," saying only that it would be conducted in a "responsible and balanced" manner. He blamed Russia for sponsoring the camouflage-wearing insurgents, who are often armed and move with a precision unlikely for local militia.

"(Russia wants) the whole south and east of Ukraine to be engulfed by fire," Turchynov said, adding the government operation aimed to "defend the citizens of Ukraine, to stop terror, stop crime and stop attempts to tear our country into pieces."

Russia strongly warned Kiev against using force against the pro-Russian protesters, saying that could prompt Moscow to walk out of Thursday's international conference on Ukraine in Geneva.

"You can't send in tanks and at the same time hold talks. The use of force would sabotage the opportunity offered by the four-party negotiations in Geneva," Russian Foreign Minister Sergey Lavrov said Tuesday.

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