LONDON, June 4, 2019 (Xinhua) -- Queen Elizabeth II (C), U.S. President Donald Trump and his wife Melania Trump attend a welcome ceremony at Buckingham Palace in London, Britain, on June 3, 2019. U.S. President Donald Trump arrived in London on Monday to start his three-day state visit to Britain as widespread protests against him are set to take place.

UPPSALA (SWEDEN), June 4, 2019 (Xinhua) -- Swedens Deputy Director of Public Prosecutions Eva-Marie Persson (1st R) attends a news conference at Uppsala District Court in Uppsala, Sweden, on June 3, 2019. A Swedish court ruled on Monday that WikiLeaks founder Julian Assange will not be detained for alleged rape, the countrys prosecution authority said.

LONDON, June 4, 2019 (Xinhua) -- Demonstrators gather outside Buckingham Palace to protest against U.S. President Donald Trump in London, Britain, on June 3, 2019. U.S. President Donald Trump was greeted with a royal family welcome and protests after he arrived in London on Monday for a three-day state visit. Protesters were out in force across the capital, mainly outside Buckingham Palace and the heavily fortified U.S. Ambassadors official residence in Regents Park.

TAMANTHI, June 4, 2019 (Xinhua) -- Researchers commute between their campsites on water in the Tamanthi Wildlife Sanctuary in north Myanmar, May 24, 2019. A China-Myanmar joint field expedition, made up with researchers from the Southeast Asia Biodiversity Research Institute of the Chinese Academy of Sciences (CAS-SEABRI) and the Natural Resources and Environmental Conservation of Myanmar, is doing researches on the biodiversity of the Tamanthi Wildlife Sanctuary in northern Myanmar. The expedition, the eighth of its kind since 2014, began on May 14 and will last till June 15.

DAOXIAN, June 4, 2019 (Xinhua) -- Aerial photo taken on June 3, 2019 shows people participating in a dragon boat race held on Xiaoshui River in Daoxian County, central Chinas Hunan Province. A total of 144 boats took part in the race to celebrate the upcoming Dragon Boat Festival, which falls on June 7 this year.

ATHENS, June 4, 2019 (Xinhua) -- Former Greek Prime Minister George Papandreou (L) presents the 2019 Cem-Papandreou International Peace Award to International Olympic Committee (IOC) President Thomas Bach in Athens, Greece, June 3, 2019. Thomas Bach received the 2019 Cem-Papandreou International Peace Award in a ceremony hosted in Athens on Monday, for his initiatives to promote peace through sports.