Ukraine's experience of hybrid warfare in Donbas will help Western partners counter expansion of aggression to Europe and the world as a whole, Ukraine's Security Service (SBU) head Vasyl Hrytsak has said.

"We have experience which no one else seems to possess – the experience of hybrid warfare. We know that this experience will help all of us do a lot of good, so that this disease, this aggression doesn't spread either in Europe or in the world at large," he said in Kyiv on Thursday, speaking at the 2016 Ukrainian defense and security forum held under the aegis of the Ukrainian Defense Ministry and Ukroboronprom state concern and attended by NATO representatives.

"Over two years, Ukraine, which has met the challenge, has been fighting in the war undeclared against us, war against the Russian aggressor … We have entered the war hardly prepared, however our army, our society, our security services are not what they used to be two years ago. We have taken control of ourselves, we are no longer scared, we started to modernize our old equipment, our structures, and we have started to strike the enemy," the SBU head said.

"It is important to us now that we have chosen our path, Euro-Atlantic integration, and I am confident that we are committed to this path and no one can force us leave it, take a different turn, no matter how they try," Hrytsak said.

Hrytsak thanked Ukraine's Western partners, in particular, the United States and NATO, "which help us understand, rethink problems related to defense capacity, the security sector."