WASHINGTON D.C., Jan. 16 (Xinhua) -- U.S. President Donald Trump and Chinese Vice Premier Liu He, who is also a member of the Political Bureau of the Communist Party of China Central Committee and chief of the Chinese side of the China-U.S. comprehensive economic dialogue, sign the China-U.S. phase-one economic and trade agreement during a ceremony at the East Room of the White House in Washington D.C., the United States, Jan. 15, 2020.

MOSCOW, Jan. 16 (Xinhua) -- Russian President Vladimir Putin (L) meets with Federal Tax Service chief Mikhail Mishustin in Moscow, Russia, on Jan. 15, 2020. Russian President Vladimir Putin has named Federal Tax Service chief Mikhail Mishustin as Russias new prime minister, the Kremlin said Wednesday.

GAZA, Jan. 16 (Xinhua) -- Photo taken on Jan. 15, 2020 shows a fireball exploding during Israeli air strikes in Gaza City. Israeli warplanes carried out on Wednesday night air strikes against military positions in the Gaza Strip in response to earlier firing of rockets from the Hamas-ruled enclave into southern Israel, eyewitnesses and security sources said.

WASHINGTON, Jan. 16 (Xinhua) -- U.S. House Speaker Nancy Pelosi (C) speaks during a press conference in Washington D.C., the United States, on Jan. 15, 2020. The U.S. House of Representatives officially sent impeachment articles against President Donald Trump to the Senate on Wednesday evening to allow a trial to get underway.

LES ROUSSES, Jan. 16 (Xinhua) -- Gold medalists Martina Trabucchi, Linda Zingerle, Nicolo Betemps and Marco Barale (from L to R) of Italy pose for photos during the mascot ceremony for the mixed relay of biathlon at 3rd Winter Youth Olympic Games at Les Tuffes Nordic Centre in Les Rousses, France, Jan. 15, 2020.