imperil

To put into peril; to place in danger.

[…]they occupied the country, expelled the inhabitants, and terminated for ever the rivalry which had so long imperilled their own naval supremacy in Greece.

"If Russia mobilises, it is for defence. No nation in the world would dream of attacking Germany, nor has Germany the slightest intention of imperilling her coming supremacy amongst the nations by such crude methods as military enterprise. Servia must be punished, naturally, but to that, in principle, every nation in Europe is agreed. We shall not permit Austria to overstep the mark."

To risk or hazard.