Via NY Times:
Declaring that Russian troops had crossed into Ukraine, President Petro O. Poroshenko on Thursday canceled a planned visit to Turkey and convened a meeting of the national security council to focus on the “marked aggravation of the situation” in the southeast of his country.Via Weekly Standard:
The meeting of the national security council will focus on shaping a response, and Ukraine will also request a meeting of the United Nations Security Council. (more)
After news broke this morning of Russia furthering its invasion of Ukraine, the White House announced that President Obama will meet with the National Security Council later this afternoon in the Situation Room:
Later in the afternoon, the President will meet with members of the National Security Council in the Situation Room. The Vice President will participate remotely via a secure line. This meeting is closed press.
4:00PM THE PRESIDENT meets with members of the National Security Council; the VICE PRESIDENT will also participate
The Situation Room
The White House did not specifically say that the Russia-Ukraine crisis is on the agenda. It's possible the meeting could be about the ongoing crisis with the terrorist army ISIS in Iraq and Syria.