Canada fully supported Israel's right to defend itself in accordance with international law, but "even wars have rules," he told the House of Commons lower chamber of parliament.
The official also appeared to dismiss concerns that the United States might struggle to supply Israel at the same time that it funnels weaponry to Ukraine.
While Russia is accusing the Ukraine of blowing up its own dam, the Ukraine and other Western countries believe that Russia is responsible for Kakhovka dam's destruction.
Trudeau's comments came after US Senate Majority Leader told broadcasters that the objects destroyed over Canada and the US were both balloons.
The Pentagon on Friday offered only a few details, including that the object was the size of a small car and that it was flying at about 40,000 feet.