Talks between the leaders of Ukraine and Russia have ended without a major breakthrough towards ending fighting between government forces and pro-Moscow separatists.
Ukrainian President Petro Poroshenko and his Russian counterpart Vladimir Putin sat down for one-on-one talks in Belarus, hours after Kiev said it had captured 10 Russian paratroopers on its territory.
Mr Poroshenko said there were "some results" but there seemed to be no significant compromises to help end four months of fighting in east Ukraine that has left more than 2,000 dead and forced more than 400,000 people from their homes.
Russia has long been accused by Kiev of backing the separatists, charges Moscow has repeatedly denied.
Mr Putin said he would "do everything" to help a future peace process but did little to ease tensions when he shrugged off the claims about the paratroopers.
"I have not yet received a report from the defence ministry. But from what I have heard, they were patrolling the border and could have ended up on Ukrainian territory," Mr Putin said, adding that Ukrainian troops had previously crossed into Russia.
"I am hoping that there won't be any problems with the Ukrainian side over this case".
Military sources in Moscow said they crossed over the border "by accident".
Ukraine's military released footage purporting to show the captured paratroopers, who were detained around 30 miles (50km) southeast of the rebel stronghold of Donetsk.