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The US dollar was little changed against a basket of peers and sterling turned negative versus the greenback and euro after news that UK Prime Minister Boris Johnson was moved to intensive care as he grew sicker with COVID-19.

The US economy is showing only early signs of recovery from a sharp downturn. Stocks slumped on Thursday as investors fretted over a new wave of coronavirus infections.

The United States and Russia both announced over the weekend that they will suspend a major nuclear weapons agreement, known as the Intermediate-Range Nuclear Forces Treaty, a decision that has triggered grave concerns over the possibility of a new arms race between the world's two largest nuclear powers.

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The US is also exerting pressure on other countries through international networks and tightening its technical restrictions on China. Science and technology cooperation and personnel exchanges between China and the US have also been affected.

The U.S. Army bought?100,000 HoloLens headsets to study how AR can help soldiers get ready for battle.

The US has long had a robust training program for Saudis, providing assistance in the US and in the kingdom. More than 850 Saudis are in the US for training activities. They are among more than 5,000 foreign students from 153 countries in the US going through military training.

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The UK National Space Academy and its Chinese partners also plan to develop innovative education experiments that will fly on future Chinese unmanned and manned space missions.

The US has been shifting blame by using China as an excuse on issues including the INF Treaty and hyping up the so-called China missile threat in disregard of the facts, Hua said.

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The US Food and Drug Administration last month announced a ban on flavored e-cigarette products aimed at teenagers but exempted tobacco-flavored and menthol pods.

The US Navy has been conducting an investigation into the situation on USS Theodore Roosevelt. A Pentagon official has also announced that it would also investigate the Navy's response to the pandemic on its ships.