HORLIVKA, Ukraine (AP) -- The fuel is local, but the matches are Russian. That in a nutshell is how the insurgency threatening the survival of Ukraine as a unified state is increasingly unfolding.
Over the past 10 days, more than a dozen government offices in eastern Ukraine have been taken over by pro-Russian forces, with most of the seizures following the same pattern. Aggressive gangs, sometimes carrying firearms and wearing military fatigues, storm the buildings. The Ukrainian flag is replaced with a Russian one. Then local men move in to hold them.
Those capturing the buildings insist they are carrying out the will of the people and have demanded a referendum on autonomy for the eastern Donetsk region. Relatively small numbers have hit the streets in support, however, and it is increasingly evident the purported uprising is far from spontaneous and is being carried out with unerring coordination.
Russia has tens of thousands of troops massed along Ukraine's eastern border. Western governments accuse Moscow of fueling the unrest and worry that the specter of bloodshed could be used as a pretext for a Russian invasion, in a repeat of events in Crimea a few weeks ago.
The Ukrainian government's inability to quash the pro-Russian insurgency was highlighted by acting President Oleksandr Turchynov's call Monday for the deployment of United Nations peacekeeping troops in the east of his country. He said the presence of Russian meddling was clear in the unrest gripping his country.
"The Russian Federation is sending special units to the east of our country, which seize administrative buildings with the use of weapons and are putting the lives of hundreds of thousands of our citizens in danger," Turchynov said, according to the presidential web-site.
Peacekeepers, however, would have to be authorized by the U.N. Security Council, where Russia holds a veto.
Pro-Russian activists point to what they say is an aggressively nationalistic government as justification for their actions. The Cabinet in charge since the overthrow of President Viktor Yanukovych in February includes some nationalist figures, but there is no substantive evidence the Russian-speaking population has been subject to any widespread intimidation in recent weeks.
The relative ease with which pro-Russian groups have been able to overwhelm resistance was in full display Monday in the Donetsk region city of Horlivka.
Hundreds of local people gathered in a square in front of the local police station. Oleksandr Sapunov, who described himself as the head of a public self-defense unit in Horlivka, said the crowd was fighting against appointees of the Kiev government, including the local police chief.
"The people came to tell him that he is a puppet of the Kiev junta and they won't accept him," Sapunov said.
Then came the moment for the switchover of the flag from Ukrainian to Russian. But in Horlivka, the head of the police force came to the ledge, chasing the man with Russian tricolor and knocking him 20 feet (6 meters) to the ground, where he banged his head.
The crowd vented its fury. Within seconds, the people hurled stones. The police inside sought to disperse them with stun grenades and by firing guns into the air, but the building was taken within about an hour.
Shortly afterward, men in fatigues marched the chief of police, blood gushing from his head, to an ambulance outside. The onlookers shouted "Donbass! Donbass!" the name of the Donetsk region, and "Ros-si-ya," or Russia.
Details of another assault also followed a similar script.
In the town of Slovyansk, a dozen armed men, many in new-looking military fatigues, swiftly and professionally secured control over the police station Saturday. A day later, local guys wearing regular clothes stood watch, using weapons raided from police stores.
Beyond a barricade blocking the road to the police headquarters, a few hundred people chanted calls for a referendum on autonomy and gave renditions of the Russian anthem.
These episodes have fed into accusations from the government in Kiev and Western officials that protests are being instigated by the Kremlin and that some of the insurgents are in fact Russian agents.
Boris Grozovsky, a commentator with the independent Russian website Colta.ru, used the fuel and matches analogy to underscore the apparent involvement of outside agents.
"In all the cities in Ukraine where there have been disturbances, it is always outsiders that have acted as the armed attackers and provocateurs," he said.
Russian Foreign Minister Sergey Lavrov again denied Monday that Russian agents were operating in eastern Ukraine, saying it would contradict Moscow's interests. He challenged Ukraine "not to be shy" about backing its claims of capturing Russian security officers with facts.