LONDON (Reuters) -Polish Foreign Minister Radoslaw Sikorski warned on Tuesday Europe must be prepared for Russia to strike deep into the region, calling it "irresponsible" not to build defences such as a "drone wall" on its eastern flank. In London to unveil an Iranian Shahed-136 drone downed in Ukraine, Sikorski urged European nations to "stay the course" in their support of Ukraine, saying he hoped U.S. President Donald Trump would make long-range Tomahawk missiles available to the country to bolster strikes against Russian infrastructure. Providing Ukraine with more munitions such as anti-aircraft assets, short-range and medium-range weapons was needed to help protect Europe, he said, pointing to incursions by drones over Poland and fighter jets over Estonia.