1.) The risk of a direct confrontation between Iran and the US will increase. Donald Trump and his team will be more pro-Israel than the previous administration. D. Trump has already been outspoken about the threat of a nuclear Iran. At the same time, Khamenei is likely to give or have already given his consent to the production of nuclear weapons.
2.) Ukraine? That's the big question. The Trump administration appears likely to end or reduce support for Ukraine. However, Trump's first administration provided more aid to Ukraine than its predecessor.
I believe that after having witnessed his first term as a President of the UN, he can really make a difference. First of all i don't see anything wrong in his slogan, Make America Great Again - we in Europe lack such leaders. Also he was the first President in American History who did not invade any country and who not only did not start any war, but he strove for peace, even succeeding to dialogue with the most erratic leader on the planet - the leader of North Korea. People might say that President Trump is not a politician. Which is good...as he is a very intelligent business man and he knows that the most important success factors for business and economy are peace and stability, which both bring investments and economic success, with all its results down to the common man in the street.