The secretary general of NATO, Anders Fogh Rasmussen, said on Wednesday that the alliance was considering providing assistance to Ukraine to help deter Russia from another military intervention there. "We have intensive consultations with the Ukrainians right now," Mr. Rasmussen said during an appearance at the Brookings Institution. "I agree that we should step up our assistance to Ukraine, and I am sure it will happen." He noted that Ukraine had requested the aid and said that he expected the foreign ministers of the alliance to decide what to provide at a meeting on April 1-2.