He complained about the "visible lack of progress" and reaching an impasse in talks with both sides.
1	He	he	PRON	PRP	Case=Nom|Gender=Masc|Number=Sing|Person=3|PronType=Prs	2	nsubj	2:nsubj	_
2	complained	complain	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	0	root	0:root	_
3	about	about	ADP	IN	_	7	case	7:case	_
4	the	the	DET	DT	Definite=Def|PronType=Art	7	det	7:det	_
5	"	"	PUNCT	``	_	7	punct	7:punct	SpaceAfter=No
6	visible	visible	ADJ	JJ	Degree=Pos	7	amod	7:amod	_
7	lack	lack	NOUN	NN	Number=Sing	2	obl	2:obl:about	_
8	of	of	ADP	IN	_	9	case	9:case	_
9	progress	progress	NOUN	NN	Number=Sing	7	nmod	7:nmod:of	SpaceAfter=No
10	"	"	PUNCT	''	_	7	punct	7:punct	_
11	and	and	CCONJ	CC	_	12	cc	12:cc	_
12	reaching	reach	VERB	VBG	VerbForm=Ger	7	conj	2:obl:about|7:conj:and	_
13	an	a	DET	DT	Definite=Ind|PronType=Art	14	det	14:det	_
14	impasse	impasse	NOUN	NN	Number=Sing	12	obj	12:obj	_
15	in	in	ADP	IN	_	16	case	16:case	_
16	talks	talk	NOUN	NNS	Number=Plur	12	obl	12:obl:in	_
17	with	with	ADP	IN	_	19	case	19:case	_
18	both	both	DET	DT	_	19	det	19:det	_
19	sides	side	NOUN	NNS	Number=Plur	16	nmod	16:nmod:with	SpaceAfter=No
20	.	.	PUNCT	.	_	2	punct	2:punct	_
