Warning Russia that new economic sanctions are "teed up," President Barack Obama accused Moscow of failing to live up to an agreement last week to ease tensions in eastern Ukraine.
Still, he cautioned that the United States needs to secure the support of allies to ensure that additional economic pressure is even applied. He conceded that new sanctions may not change Russian President Vladimir Putin's geopolitical calculations.
"There are some things the United States can do alone but ultimately it's going to have to be a joint effort, a collective effort," Obama said during a press conference with Japanese Prime Minister Shinzo Abe.
Obama's comments underscored the difficulties he faces in devising a response to Russia's aggressive moves on Ukraine's eastern border and the growing unrest in the country driven by pro-Russian insurgents. He did not put a timeline on when sanctions could be applied, saying only it was a matter of days, not weeks.