President Obama says he has not yet decided whether to send arms to the Ukrainian military to fight Russian-backed rebels. Obama criticized Russia’s role in the conflict during a joint news conference at the White House with German Chancellor Angela Merkel.

President Obama: “Unfortunately, Russia has made a decision that I think is bad for them strategically, bad for Europe, bad for the world. And in the face of this aggression and these bad decisions, we can’t simply try to talk them out of it. We have to show them that the world is unified in imposing a cost for this aggression.”

On Wednesday, Chancellor Merkel will travel to the Belarus capital of Minsk for talks with the leaders of Russia, Ukraine and France in an attempt to end the crisis, which has killed more than 5,400 people. We will have more on Ukraine after headlines.