The Ministry of Foreign Affairs said Moscow is the only credible source of information.
Investigators told the victims' families that the rocket was fired from rebel-held ground.
Tank and artillery were allegedly used by Russian-backed forces despite pledges to halt hostilities at midnight.
Kiev's military intelligence posted photos of the man's Russian ID.
Protesters continue to gather in front of Ukraine's controversial Inter TV channel.
A Ukrainian national was arrested driving into rebel-held Horlivka with hidden cash.
Investigative group Bellingcat report "thousands of Russian servicemen" active in eastern Ukraine.
The first day of school is a day of celebration in Ukraine.
Kiev estimates tanks in rebel areas increased from 30 to 600 since 2014.
The three will speak on the sidelines at the upcoming G20 summit in China.
Six were also injured as the situation in the east grows more volatile.
Violations of the ceasefire and casualties have skyrocketed this summer.
The GOP candidate clarified his remarks, but questions about his view of Crimea remain.
Ukraine's representative in peace talks said rebels also have extensive artillery.
Parliamentary chairman Andrey Parubiy said NATO membership is "a matter of time."
On Ukraine's front lines, those who speak out are under constant threat of retaliation from the militias in power.
The pilot also said another world war could return Crimea to Ukraine.
Seven soldiers were killed and nine injured in eastern Ukraine, state officials report.
Over 30 armored vehicles were recorded crossing what appears to be Luhansk city.
The Mejlis is moving after a Russian-run court deemed it "extremist."
"This is Russia destabilizing Eastern Ukraine," said Jens Stoltenberg.