In letter to UN rights chief, Washington says an invasion could lead to 'kidnappings or torture' of 'political dissidents and religious and ethnic minorities'

Artillery fire spikes as fears mount Russia is paving the way for an invasion; 2 Ukrainian soldiers killed; pro-Russia separatists mobilize for war and evacuate civilians

ImageSat International says some military vehicles can be seen near staging grounds in possible preparation for invasion of southern Ukraine

Kamala Harris tells Ukrainian president that Moscow will face 'unprecedented economic costs' if it launches invasion; UK's Johnson urges Western unity against Russian threats

US defense chief says Russian forces moving into positions 'to be able to conduct an attack'; Ukrainian soldier killed amid 'dramatic increase' in clashes with separatists

Putin warns 'situation deteriorating' as US accuses Moscow of trying to provoke an incident to falsely justify invasion; US envoy says up to 190,000 Russian troops massed on border

The worries are likely farfetched, but experts say bad actors could potentially generate a genetic scandal, not a presidential clone

Military says Putin to monitor the large-scale exercise on Saturday, as tensions with West at highest level since Cold War

Diplomats to huddle at Munich security confab, which Moscow has so far declined to attend; Britain, US say Russia has increased troops, as Kremlin claims more tanks withdrawn

Commercial satellite company's high-resolution images show Russian troops' staging grounds, airfields, artillery positions on Ukrainian borders, but can't provide a full picture