Obama says U.S. not interested in threatening Russia

U.S. President Barack Obama said on Tuesday the United States was not interested in threatening Moscow but cautioned that it would take a lot of time to rebuild trust after Russia's  intervention in Ukraine.
  
Obama, speaking at a press conference in Poland, said more sanctions were being prepared against Russia if the West continued to see it engaged in activities that were destabilizing to Ukraine.

For his part, Polish President Bronislaw Komorowski welcomed a U.S. plan to boost its temporary military presence in eastern Europe in response to Russia's intervention in Ukraine.
  
"The U.S. authorities' decisions to increase the level of presence in NATO's eastern members are incredibly important," Komorowski told a joint news conference with visiting U.S. President Barack Obama.
  
"We welcome them as an announcement of a real return by NATO to standing very strongly by the basis of the alliance, which is article 5, which speaks about the collective defense of the countries' territories," Komorowski said.

Earlier, President Barack Obama said the security of America's allies in Europe is sacrosanct. He said it's a cornerstone of U.S. security.

Obama is speaking in Warsaw, Poland, after arriving on a four-day visit to Europe. He's mounting a show of military cooperation with Poland in front of American and Polish F-16 fighter jets.

Obama says Poland is one of America's strongest allies. He says the U.S. honors its commitments.

Polish President Komorowski says the U.S. and Poland have a special brotherhood dating back centuries.