Those presidential trips made clear that the United States stood with its Western allies for as long as it took to prevail over the Soviet Union. Biden's visit was meant to give similar historic heft to his comment that Washington is there for "as long as it takes" -- though it's unlikely that it will assuage fears in Kyiv and Europe that a change in president might weaken that US vow.
Biden's secret visit, which involved the president leaving the US unannounced and heading to an active war zone, matched some of the colorful stagecraft that Zelensky -- a master of public relations -- has used to maintain Western support for his people and the multi-billion dollar pipeline of weapons and aid.
During America's Middle East wars of the last 20 years, Americans became accustomed to Presidents George W. Bush, Barack Obama and Donald Trump leaving Washington in the dead of night and popping up in Baghdad or Kabul to visit US troops and US-backed leaders. And while those trips had their own measure of daring and danger, Biden's visit went a step further -- venturing into a foreign capital that is often under air attack and lacks the security offered by large garrisons of American troops and air assets.
Biden had always planned to visit Europe this week to mark the anniversary of the Russian invasion -- though his public program mentioned only a trip to neighboring Poland. But a journey across the Atlantic that lacked a Ukrainian component would have been unsatisfactory given that fact that many European leaders have already visited Kyiv. Still, the security footprint of the US president is far greater than the one accompanying those leaders, and his position as the leader of the West leaves him far more exposed.
But by not visiting Ukraine, Biden would have been implicitly admitting that there were some things that Putin could prevent him from doing -- in effect showing US weakness.
Political symbolism is only effective if it gets results, drives policy and changes an entrenched situation.
So, like the Berlin visits of Kennedy and Reagan, the true historic sweep of Biden's perilous journey to Ukraine can only be judged in the light of subsequent events. In other words, his gesture will be an empty one if Russia -- which appears to be mustering for a spring offensive -- wins the war.