Polish Foreign Minister Witold Waszczykowski said Friday that Russia might respond to the US strike in Syria by escalating fighting in war-torn eastern Ukraine.

“Now everyone is waiting for the reaction from Russia. Either it will react in Syria or, as some say, unfortunately, in Ukraine,” Waszczykowski said on Polish TV.

“There is a certain danger here, because Russia’s policy is unpredictable and in some cases even unreasonable. No doubt, there will be some answer. The only question is where.”

On April 7, the US fired more than 50 cruise missiles at a Syrian airfield in response to Syrian President Bashar Assad’s use of chemical weapons on civilians.