I've never said Biden caused the war in Ukraine. Putin felt comfortable invading during Biden's tenure. Why do you think that is?The current war in Ukraine, has nothing to do with Biden. Biden did not cause the war in anyway. Putin chose to invade. Similarly, North Korea's behaviour was nothing different either. Immediately after the summit with Trump, the North Koreans tested ballistic missiles effectively violating their promise made to Trump. Trump did nothing different or effective when it comes to foreign policy, except for embarrassing the US on the world stage, with his unprofessional behaviour.
North Korea did indeed test missiles after meeting with Trump but the tests were few and were mostly short range type. Many nations test short range as part of their military defence complex.
Just for fun, why don't you look up at how many tests have been carried out during Biden's tenure and how many were mid to long range (ICMB). I think you will be surprised...if not scared. Why do you think that is?