say you are no longer going to be able to be the president of russia. >> reporter: the us and european allies announce new sanctions directly impacting president putin but in an exclusive interview with fox news digital, donald trump doubted their effectiveness. >> they are going to have to do more than sanctions but sanctions, vladimir putin has had sanctions always and he understands how to avoid sanctions and he goes through other countries, he goes through china as an example but the sanctions have to be strong. >> reporter: he went on to praise volodymyr zelenskyy who continues to fight in the streets alongside his citizens, the world needs to start russia now before the war comes to them, sentiment echoed by donald trump. >> this could lead much bigger than this one area, this could lead to a lot of other countries and could lead to world war, you never know how it starts, world war start, you never think of war will come out of it and you end up in a world war, very dangerous