By Gabriel Crossley, David Brunnstrom and Michael Martina BEIJING/WASHINGTON (Reuters) -China told the United States on Thursday it wants all sides involved in Ukraine to remain calm and avoid increasing tensions, while Washington stressed de-escalation and warned of the security and economic risks from any Russian aggression. “We call on all parties to stay calm and refrain from doing things that agitate tensions and hype up the crisis,” China’s Foreign Ministry quoted Foreign Minister Wang Yi as telling U.S. Secretary of State Antony Blinken in a telephone call. Later on Thursday, China’s U….

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