Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-7pm ET on CNN.
Russian's decision to fly patrols over Gulf of Mexico waters is causing a stir in the U.S. military. Brian Todd reports. Full story
Russia has denied allegations that it has sent weapons inside Ukraine. Jim Sciutto reports.
Ukraine prepares for fighting as Russian forces move weapons and troops into the country. Jim Sciutto reports.
CNN's Jim Sciutto reports on the collapsing ceasefire between Ukraine and pro-Russian separatists. Full story
Accusations Russia behind new Ukraine violence
Wolf Blitzer talks to Daniel Baer, U.S. Amb. to Org. for Sec. & Cooperation in Europe about the recent violence in the region.
Wolf Blitzer talks to Rear Admiral John Kirby about the severity of U.S. and Canadian jets intercepting Russian planes.
Ukraine's president Petro Poroshenko speaks to CNN's Wolf Blitzer on the country's plea for substantive military aid.
More of the interview:
The battle for eastern Ukraine continues to rage on as government forces push further against pro-Russian separatists. CNN's Nick Paton Walsh reports on the ongoing violence - as Russia masses more troops on the border.