North Korean leader Kim Jong-un has indicated that he is open to a third summit with US President Donald Trump, but only if the US makes a “bold decision” before the end of the year. Kim also added that “it will definitely be difficult to get such a good opportunity as the previous summit.”

The statements follow remarks by Trump who recently indicated that a third US-North Korea summit was a possibility. Last week, Kim actually seemed to adopt a more hostile attitude toward the US, when he said that his efforts to build a self-supporting national economy for North Korea would “deal a telling blow” to those behind the sanctions on his country. Trump and Kim met in Vietnam earlier this year, but that summit broke down.

Read more: North Korea’s Kim willing to meet Trump a third time but gives U.S. an end-of-year deadline