Obama and Merkel Express Unity in Seeking Diplomatic Solution to Russia-Ukraine Crisis

President Obama said he was weighing providing lethal weapons to Ukraine to help Kiev defend against Russia’s aggression if diplomatic efforts fail to defuse the tensions there, even as he said the United States remained united with Europe in maintaining sanctions against Moscow.

“The prospect for a military solution to this problem has always been low,” Mr. Obama said, given the extraordinarily powerful military that is at the disposal of President Vladimir V. Putin of Russia, and the length of Russia’s border with Ukraine.

Nevertheless, at a joint news conference with German Chancellor Angela Merkel at the White Hous