The Pentagon estimates there are now about 20,000 Russian troops in Ukraine, as additional forces have gone into the country over the last week.
Rear Adm. John Kirby says Defense Secretary Chuck Hagel spoke with Ukraine Defense Minister Ihor Tenyuh on Friday. He says Tenyuh asked Hagel to consider having the US military provide Ukraine with technical advice, including on humanitarian and disaster relief operations. Hagel said he would consider the request. (AP)