The US on Sunday released satellite images it said backed up its claims that rockets have been fired from Russia into eastern Ukraine and heavy artillery for separatists has also crossed the border.

A four-page document released by the State Department seemed to show blast marks from where rockets were launched and craters where they landed. Officials said the images, which were sourced from the US director of national intelligence, showed heavy weapons fired between 21 July and 26 July, after the 17 July downing of Malaysia Airlines Flight 17, over eastern Ukraine.



All 298 people onboard MH17 were killed.

The memo is part of the Obama administration's push to hold Russia accountable for its activities in neighboring Ukraine and the release could help to persuade the US' European allies to apply harsher sanctions on Russia.

The timing of the memo also could be aimed at dissuading Russia from further military posturing. The Pentagon said just days ago that the movement of Russian heavy-caliber artillery systems across its border into Ukraine was "imminent”.

Russian officials have denied allegations of Russia's involvement in eastern Ukraine. Secretary of State John Kerry spoke on Sunday with Russian foreign minister Sergei Lavrov, but details about their discussion were not immediately released by the State Department.

The US images claim to show multiple rocket launchers fired at Ukrainian forces from within Ukraine and from Russian soil. One image shows dozens of craters around a Ukrainian military unit and rockets that can travel more than seven miles.

The memo said one image provides evidence that Russian forces have "fired across the border at Ukrainian military forces and that Russian-backed separatists have used heavy artillery provided by Russia in attacks on Ukrainian forces from inside Ukraine”.

Another satellite image depicted in the memo shows "ground scarring at multiple rocket launch sites on the Russian side of the border oriented in the direction of Ukraine military units within Ukraine."

"The wide areas of impact near the Ukrainian military units indicates fire from multiple rocket launchers," the memo said.

Moreover, the memo included a satellite image that it stated is evidence of self-propelled artillery only found in Russian military units "on the Russian side of the border oriented in the direction of a Ukrainian military unit within Ukraine”.

Multiple Rocket Launcher Strikes within Ukraine (25/26 July) pic.twitter.com/unPzVA7uOZ — Geoffrey Pyatt (@GeoffPyatt) July 27, 2014

Tensions have run high in the region since Russia seized Crimea in March and Washington has been highly critical of the behaviour of Russia's President Vladimir Putin. More recently, US intelligence officials have said they have what they call a solid circumstantial case that pro-Russia separatists in eastern Ukraine are responsible for downing the Malaysia Airlines plane.



Citing satellite imagery, intercepted conversations and social-media postings, officials say a Russian-made SA-11 surface-to-air missile hit the plane on 17 July.

Multiple Rocket Launcher Strikes Within Ukraine (21 July 14) pic.twitter.com/i6IgcCkAl2 — Geoffrey Pyatt (@GeoffPyatt) July 27, 2014

Moscow angrily denies any involvement in the attack.

US officials said they still did not know who fired the missile or whether Russian military officers were present when it happened. But until Sunday they were unwilling to share proof that the separatists had the technology to down a plane.