Seoul (CNN)President Joe Biden did not sound Saturday like he was expecting any "love letters" from Kim Jong Un -- he can't even get a response to an offer of coronavirus vaccines as the hermit kingdom is hit by its first major Covid-19 outbreak. And during a news conference here Saturday, he did not sound particularly eager for a handshake with the North Korean despot. "That would depend on whether he's sincere and whether he's serious," Biden said when asked whether he'd be willing to meet Kim. The days of glitzy, leader-to-leader summits and other photo ops that defined President Donald Trump's diplomatic forays with North Korea and elevated Kim appear over for now. So are the attempts at a grand bargain, "everything for everything" denuclearization agreement.