With Washington hinting it might soften its tough stance to break the deadlock, top US negotiator, Christopher Hill, said the two sides needed to review the situation.
With Washington hinting it might soften its tough stance to break the deadlock, top US negotiator, Christopher Hill, said several sides need to review the situation.
Whether 'several' is equivalent to 'two' is subjective. 
( z1 say :ARG0 ( z2 person :name ( z3 name :op "Christopher" :op "Hill" ) :ARG0-of ( z4 negotiate :ARG1 ( z5 country :name ( z6 name :op "US" ) ) :mod ( z7 top ) ) ) :ARG1 ( z8 need :ARG0 ( z9 side :quant ( z10 several ) ) :ARG1 ( z11 review :ARG0 z9 :ARG1 ( z12 situation ) ) ) :time ( z13 hint :ARG0 ( z14 city :name ( z15 name :op "Washington" ) ) :ARG1 ( z16 possible :ARG1 ( z17 soften :ARG0 z14 :ARG1 ( z18 stand :ARG0 z14 :ARG1-of ( z19 tough ) ) :purpose ( z20 break :ARG0 z14 :ARG1 ( z21 deadlock ) ) ) ) ) )