1
President's Vladimir Putin's refusal to hand him over aggravated already tense relations with the United States.
2
His remarks, repeated by ministers and government-friendly media, have aggravated already strained relations between Berlin and Ankara.
3
The launch, which followed the North's fourth nuclear test last month, aggravated already-strained ties between the rival Koreas.
4
Record temperatures over the three-day Labour Day weekend have aggravated already dangerous fire conditions and further stressed exhausted California firefighters.
5
Record temperatures over the three-day Labor Day weekend have aggravated already dangerous fire conditions and further stressed exhausted California firefighters.
6
The killings of Garner and Brown have aggravated already strained relations between police and black Americans and rekindled a national debate over race relations.