the u.s. and its allies are scrambling to respond to putin's provocation and fears that the war they have been trying to prevent may now become a reality. cnn is on the scene in russia, in ukraine and here in the u.s. as we cover this major breaking story. we want to welcome our viewers here in the united states and around the world. i'm wolf blitzer. this is a "situation room" special report. >> let's get right to the breaking news on vladimir putin ordering so-called peacekeeping forces into separatist-held parts of ukraine. our chief international correspondent clarissa ward is in the ukranian capital of kyiv for us. clarissa, russian troops could be arriving in ukraine very, very soon. >> reporter: that's right. president violence key is expected to address the nation