Amnesty International charged Monday that Kiev's forces fighting in eastern Ukraine may be guilty of extrajudicial killings, as well as the pro-Russian rebels.

The rights group found evidence of deliberate killings "attributable to both sides, but not on the scale reported by Russian media and authorities," the rights group said in a report.

German intelligence has accused pro-Russian rebels of shooting down a Malaysian passenger jet over Ukraine using missiles captured from government forces, a media report said Sunday.

Kiev and the West have previously charged that Malaysia Airlines Flight MH17 was blown out of the sky in July by separatist fighters using a BUK surface-to-air system supplied by Russia, charges denied by Moscow.

War-weary Ukrainians pick a powerful new parliament next Sunday set to be dominated by pro-Western and nationalist forces who will determine if President Petro Poroshenko can make peace with the Kremlin while holding on to the separatist east.

But it will be a vote held on a war footing in which millions of ethnic Russians in Ukraine will not be able to cast ballots because their lands have been either annexed by the Kremlin or seized by pro-Moscow militants.

Two Ukrainian soldiers have been killed in combat with pro-Russian rebels in east Ukraine, Kiev's military said Saturday, as violence rocked a truce after talks between Kiev and Moscow ended without a breakthrough.

"Two Ukrainian soldiers were killed over the last day, three were injured," said spokesman Volodymyr Polyovy.

Russian President Vladimir Putin was cooperative and constructive when asked for his help in allowing investigators access to the MH17 crash site in Ukraine, Australian Foreign Minister Julie Bishop said Saturday.

Bishop met the Russian leader on the sidelines of the Asia-Europe Meeting, just days after Australian Prime Minister Tony Abbott warned he would confront Putin over the shooting down of the plane at a G20 meet next month.

Ukraine and Russia both signaled progress towards settling their festering row over gas Friday, raising hopes of an EU-backed resolution of the broader conflict embroiling the Soviet-era allies.

Russian President Vladimir Putin met his Ukrainian counterpart three times in the space of ten hours in Milan Friday, twice in the company of various European Union leaders then, finally, in their first private meeting since late August.

Russian President Vladimir Putin said Friday he had had "good" talks about the Ukraine crisis with his Ukrainian counterpart Petro Poroshenko and EU leaders in Milan.

Asked by journalists how the talks had gone, Putin said simply they were "good", the state news agency TASS reported.

Eleven Ukrainian soldiers are missing in action after getting caught in an ambush in the conflict-torn east, while another three were killed in fighting, Kiev's military said Friday.

The latest clashes rocked an already battered ceasefire deal between Kiev and pro-Moscow rebels, as President Petro Poroshenko held key talks with Russian leader Vladimir Putin in Milan.

Germany may not send drones to help monitor the Ukraine-Russian border as promised, in part because the surveillance aircraft doesn't work in very icy temperatures, a lawmaker said Friday.

The "Luna" unmanned aerial vehicle does not work at below minus 19 degrees Centigrade (minus two degrees Fahrenheit), the lawmaker said, confirming a Bild daily report.

German Chancellor Angela Merkel and Russian President Vladimir Putin have major differences over the origin and causes of the conflict in Ukraine, the Kremlin said following talks between the two leaders.

"There are still serious differences concerning the origin of Ukraine's internal conflict, as well as the root causes of what is currently happening," Russian news agencies quoted Putin's spokesman Dmitry Peskov as saying early Friday.