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Satellite imagery indicates that Russian forces have gathered on the Ukraine border ahead of a planned video call this week between Presidents Joe Biden and Vladimir Putin.

Biden and Putin will speak in a video call Tuesday, the Kremlin said, as tensions between the United States and Russia escalate over a Russian troop buildup on the Ukrainian border.

Satellite imagery of the buildup was collected by Maxar Technologies over the past month and provided to Fox News.

(Satellite image ©2021 Maxar Technologies)

Kremlin spokesman Dmitry Peskov confirmed plans for the conversation to Russia's state news agency RIA Novosti, saying that "the presidents will decide themselves" how long their talk will last.

The pictures highlight several locations within western Russia, as well as one location in Crimea, where Russian tactical battle groups containing troops and ground forces equipment have been deployed.

US SEES SIGNS RUSSIA PLANS UKRAINE INVASION IN EARLY 2022

(Satellite image ©2021 Maxar Technologies)

Biden will press U.S. concerns about Russian military activities on the border and "reaffirm the United States’ support for the sovereignty and territorial integrity of Ukraine," White House press secretary Jen Psaki said Saturday, confirming the planned call after first word came from Moscow.

The last known call between the leaders was in July, when Biden pressed Putin to rein in Russia-based criminal hacking gangs launching ransomware attacks against the United States. Biden said the U.S. would take any necessary steps to protect critical infrastructure from any such attacks.

Russian President Vladimir Putin

Russian President Vladimir Putin (The Associated Press)

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Amid the other satellite imagery collected by Maxar over the past month, other locations included where Russian tactical battle groups containing troops and ground forces amassed and deployed their equipment.

The Associated Press contributed to this report.