NEW : Polish , Czech leaders cautiously optimistic about U.S. commitment . `` Here Moscow is n't likely to be of much help to the White House . Russian president : `` We appreciate the responsible approach '' of U.S. leader . " Comment: The US is not going to be able to do anything without a UN resolution and Russia has already said that they will veto any such move. Change of gears does creates diplomatic problems for U.S. , expert says .
NEW : Polish , Czech leaders cautiously optimistic about U.S. commitment . Russian president : `` We appreciate the responsible approach '' of U.S. leader . " Comment: The US is not going to be able to do anything without a UN resolution and Russia has already said that they will veto any such move. Change of gears does creates diplomatic problems for U.S. , expert says .