European Council President Donald Tusk (R) welcomes U.S. Vice President Mike Pence in Brussels, Belgium, Feb. 20, 2017. U.S. Vice President Mike Pence on Monday reaffirmed "strong commitments" to the European Union (EU), in a bid to allay the bloc's doubts on the new U.S. administration's stance towards it. (Xinhua/Gong Bing)