Russia has 70% of the military capabilities in place for full-scale invasion, according to US officials

This satellite image provided by Maxar Technologies shows a troop housing area and vehicle park in Rechitsa, Belarus on February 4. Russia has moved troops from Siberia and the Far East to Belarus for sweeping joint drills. (Maxar Technologies/AP)

Russian President Vladimir Putin has now assembled 70% of the military personnel and weapons on Ukraine's borders he would need for a full-scale invasion of the country, according to two US officials familiar with the latest estimates.

The figure is an estimate based on the latest intelligence assessments, but officials would not specify the intelligence they had or how they developed their assessments, citing the sensitivity of how they collect the information.

The assessment represents the continuing significant buildup of Russian forces on Ukraine's borders, but it's unclear how long it would take Putin to ramp up further, or whether the Russian president would need full capabilities in order to invade.

The human cost could be dire: Some assessments calculate civilian casualties in Ukraine could run into the tens of thousands with up to five million refugees.

US officials publicly and privately still say they do not know if Putin has made a final decision on any type of military action, but behind the scenes, President Biden's national security and intelligence teams are calculating various scenarios and the potential outcomes.