Ukraine forces fire US long-range rocket systems at Russian targets.

Ukraine forces fire US long-range rocket systems at Russian targets.

Video uploaded on social media on Friday allegedly shows US long-range rocket systems being fired by Ukrainian troops from an undisclosed location in Ukraine.

Ukraine said on Thursday (June 23) it had received U.S. supplies of High Mobility Artillery Rocket Systems (HIMARS), a powerful long-range weapon system that Kyiv hopes can help turn the tide on Russia's invasion.

The uploader of the video describes the weapon as a M142 HIMARS.

Reuters was not able to verify the location or date the video was filmed. The video shows the firing of what purports to be a High Mobility Artillery Rocket System (HIMARS). The shape of the weapon matches file images of the rocket system.

Washington has said it has received assurances from Kyiv that those longer-range weapons would not be used to attack Russian territory, fearing an escalation of the conflict.

Moscow's forces are advancing in Ukraine's east in a bid to capture the industrial heartland known as the Donbas where Ukraine fears some of its troops could be encircled in a Russian pincer.

Moscow has warned it will strike targets in Ukraine which they "have not yet been hitting" if the West supplies longer-range missiles to Ukraine for use in high-precision mobile rocket systems.

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