Dhaka, June 15 -- Ukrainian forces have stopped Russian troops advancing in the northeastern Sumy region and are now battling along the border to regain control, President Volodymyr Zelensky said.In remarks released for publication by his office on Saturday, Zelenskiy said that Moscow has amassed about 53,000 troops in the direction of Sumy. "We are leveling the position. The fighting there is along the border. You should understand that the enemy has been stopped there. And the maximum depth at which the fighting takes place is 7 km from the border," Zelensky said.Russia's troops have been focusing their assaults in the eastern Donetsk region, but since the start of the month, they have intensified their attacks in the north-east, announ...