Russian troops and military planes have begun flowing into Crimea according to Ukrainian Border guards.
The country's Defence Minister has accused Russia of sending 6,000 additional troops into Crimea in violation of accords between the two countries,.
EU Foreign ministers are meeting this lunchtime to discuss the crisis that threatens to escalate into the worst since the Cold War.
Speaking on his way into the meeting Tainiste and Minister for Foreign Affairs Eamonn Gilmore said sanctions will be discussed at today's meeting.
Sabra Ayres is Global Radio News Correspondent in Sevastopol in Ukraine
She spoke to Sinead Spain