Russia's aggression to dominate Obama Europe trip

WASHINGTON (AP) — President Barack Obama will seek a cohesive stance from European leaders unnerved by Russian aggression toward Ukraine but also wary of economic punishment the United States says it's willing to unleash if Moscow makes further expansionist moves.

Obama's cross-Atlantic trip was scheduled long before Russia moved to annex the Crimean Peninsula. But Russia's actions will now dominate Obama's visit as the president and U.S. allies seek to confront one of the most serious political crises in Europe since the Cold War.

Obama will meet with leaders of the Group of Seven leading economies on Monday to display a unified stance against Moscow. Ukraine will also be the leading topic in a U.S. summit meeting in Brussels with the European Union and in Obama's meeting with the secretary general of NATO.