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WRAPUP 9-Ukraine pushes back Russian troops in counter-offensive near Kharkiv

(Adds details of fighting in Luhansk)

* Ukraine counter-offensive could shift war's momentum

* Ukrainian forces seeking to cut off Russian supply lines

* U.S. concerned about future course of war

By Jonathan Landay

KHARKIV, Ukraine, May 10 (Reuters) - Ukraine said on Tuesday its forces had recaptured villages from Russian troops north and northeast of the city of Kharkiv, pressing a counter-offensive that could signal a shift in the war's momentum and jeopardise Russia's main advance.

Ukrainian troops in recent days recaptured four settlements north of Ukraine's second-largest city, said Tetiana Apatchenko, a press officer with the main Ukrainian force in the area.

President Volodymyr Zelenskiy said the Ukrainian successes were gradually pushing Russian forces out of Kharkiv in the country's northeast, which has been under perpetual bombardment since the war began.

"But I also want to urge all our people... not to spread excessive emotions. We should not create an atmosphere of excessive moral pressure, where victories are expected weekly and even daily," Zelenskiy said in a video address.

In Washington, top U.S. intelligence officials said the war was at a stalemate. President Vladimir Putin appeared to be preparing for a long conflict, and a Russian victory in the Ukraine's eastern Donbas region might not end the war, Director of National Intelligence Avril Haines said.

But the counterattack near Kharkiv could signal a new phase, with Ukraine now going on the offensive after weeks in which Russia mounted a massive assault without making a breakthrough.

By pushing back Russian forces who had occupied the outskirts of Kharkiv since the start of the invasion, the Ukrainians are moving into striking distance of the rear supply lines sustaining the main Russian attack force further south.

"Ukrainians are getting close to the Russian border. So all the gains that the Russians made in the early days in the northeast of Ukraine are increasingly slipping away," said Neil Melvin of the RUSI think-tank in London.

CHALLENGES

During a Red Square military parade on Monday marking the end of World War Two, Putin exhorted Russians to keep fighting but gave no indication of his further strategy.

Since Russia was forced to abandon an assault on the capital Kyiv at the end of March, its main force has been trying to encircle Ukrainian troops in the Donbas, using the city of Izyum south of Kharkiv as a base. Ukrainian troops have so far mostly held out against assaults from three directions.

But by pushing back near Kharkiv, Ukraine could now force Moscow to switch to trying to defend its own long supply lines to Izyum. Western military analysts said there were signs the counter-attack was already sapping Russia's advance.