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.
The deadlock must be addressed by all parties involved to reach resolution.
This statement was made in inference to the passage but the vocabulary used in the statement was not present in the passage. 
( z1 obligate :ARG2 ( z2 address :ARG0 ( z3 party :mod ( z4 all ) :ARG1-of ( z5 involve ) ) :ARG1 ( z6 deadlock ) :purpose ( z7 reach :ARG0 z3 :ARG1 ( z8 resolve ) ) ) )