Hundreds of jihadists are “planning to strike Western targets on European soil,” Israeli Defense Minister Moshe Ya’alon told his counterpart Antoni Macierewicz, Poland’s minister of national defense.

“We are concerned that what we saw in Paris [in November 2015] and Brussels [in March 2016] is just the start, and that attempts to carry out terror attacks in Europe will continue,” Ya’alon said.

Ya’alon hosted Macierewicz on Wednesday in Tel Aviv, with the two ministers discussing terrorism in Europe, the Syrian civil war, and other Middle East issues.

“We do not expect there to be stability and an end to the bloodshed in Syria anytime soon,” Ya’alon said. “In the war there, there are many conflicting interests and too many players in the arena. Some of these players, the global jihad organizations for example, are determined to continue fighting.”

Ya’alon added that Israel and Poland should strengthen their defense ties.

“Defense cooperation benefits both countries,” he said. “Unfortunately, Israel is very experienced in dealing with these challenges, both in in their conventional and terrorist perspectives, rockets, and more. We are prepared to cooperate and share knowledge and technology.”