(CNN) - Americans are increasingly concerned about the ongoing situation in Ukraine, but few express support for using U.S. military force in that county, according to a new national survey released Monday.
A CNN/ORC International poll also indicates that even if economic and diplomatic efforts fail in curbing Russia's aggression in the region, Americans still oppose U.S. military involvement.
One quarter of those surveyed view Russia as an enemy of the United States, but only 18% see Ukraine as an ally.
Thirty-six percent said they are very concerned about the situation in Ukraine – up six-percentage points since CNN last asked that question in early March. Those who said they were not concerned about the crisis dropped five points, to 22%.
Obama losing trust as commander in chief
Opinion is split on how President Barack Obama is handling the conflict in Ukraine, with 48% approving his approach and 44% disapproving.
But 52% of respondents say they do not trust Obama as commander in chief. That's a 14-point jump from when the same question was asked in 2011.
How should President Barack Obama react?
Only six percent say the United States should use military action immediately against Russia. Sixty-five percent support economic and diplomatic actions, while 28% said Americans should take no action.
But if the economic sanctions and efforts for a diplomatic solution doesn't work, should the United States use military force at that point?
Thirty-eight percent, including the 6% pushing for military action now, say yes, while nearly six in ten say the United States should still withhold military action.
And when asked about global policy, rather than a specific question on Ukraine, 84% said the United States should use military force only as a last resort.
Enemies and allies
Americans have a negative view of Russia, but that country is seen as much less of a threat than several others tested in the poll.
Over half of respondents say North Korea is an enemy of the United States, followed by Iran (47%), Afghanistan (34%) and Syria (30%). Just 25% of Americans say that Russia is an enemy.
Americans list Great Britain as the greatest ally to the United States. It stands at 65% in the survey compared to France at 46%, Germany at 44% and Poland at 31%. Only 18% of respondents say that Ukraine is an American ally, which most describing that country as friendly to the U.S. but not an ally.
As for Russia, over two-thirds of those surveyed said the former Soviet Union is unfriendly to the United States – a significant jump from 2011 when that number stood at 37% and in 2003 when only 30% of Americans viewed Russia as unfriendly
The poll was conducted for CNN by ORC International from May 2-4, with 1,008 adult questioned by telephone. The overall sampling error is plus or minus three percentage points.
CNN's Dana Davidsen contributed to this report.