Service members of pro-Russian troops in uniforms without insignia are seen next to an armoured vehicle with the symbol "ZService members of pro-Russian troops in uniforms without insignia are seen next to an armoured vehicle with the symbol “Z” painted on its side in the separatist-controlled village of Bugas during Ukraine-Russia conflict in the Donetsk region, Ukraine March 6, 2022. 

A senior Pentagon official said Monday that nearly all of the troops that Russia had on the border with Ukraine are now fighting inside the country.

President Joe Biden has said that Russia had 190,000 troops outside of Ukraine.

Even with so much manpower deployed, the two main Russian convoys outside of Ukraine are still stuck.

Russian tanks and trucks have been stranded in eastern and central Ukraine because of a weak logistical system, which has resulted in many of them breaking down or running out of gas.

The United States will deploy another 500 troops to Europe, bringing the total number of American forces in Europe to more than 100,000, a senior defense official said.

In recent weeks, thousands of these troops have taken up positions in countries along NATO's eastern flank.

Logistical problems on the ground haven't stopped Russia from hitting Ukraine with heavy weaponry. Russian forces have fired more than 625 missiles at Ukrainian targets.

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