Amid the pomp and ceremony of a full state visit, Chinese leader Hu Jintao has been warmly received at the White House.
Given a welcome normally reserved for close allies, Hu is on a four-day trip to the US, which will include a formal state dinner. US President Barack Obama has already hosted a rare private dinner with Hu in the White House.
Both leaders have thorny issues to raise, including North Korea and Taiwan, as well as the sensitive subject of trade imbalances.
One report in Washington says the US and China plan to announce that they have reached a deal to boost cooperation on nuclear security. Both men say they are determined to improve cooperation. However, experts say they are not expecting any major breakthroughs on the difficult issues.
Critics of the Chinese leader, including pro-Tibet campaigners, are bristling at the pomp and ceremony he is receiving.