Donald Trump has showered himself in praise after landing back in the U.S. from his summit with Kim Jong Un in Singapore, saying North Korea is no longer a nuclear threat. The president tweeted early Wednesday morning: “Just landed—a long trip, but everybody can now feel much safer than the day I took office. There is no longer a Nuclear Threat from North Korea. Meeting with Kim Jong Un was an interesting and very positive experience. North Korea has great potential for the future! Before taking office people were assuming that we were going to War with North Korea. President Obama said that North Korea was our biggest and most dangerous problem. No longer—sleep well tonight!” Critics have said the document signed by Trump and Kim went no further on denuclearization than previous agreements.