looked ahead to the future, renewing the atlantic charter to emphasize their alliance. >> today we build on that commitment. >> reporter: biden and johnson also agreeing to work on restoring travel between the two nations shut down by the covid-19 pandemic. but one of the biggest points of tension between the two leaders is the status of northern ireland where brexit-fueled tensions have broken out and in the past biden has insisted on maintaining the good friday agreement. >> we do not want a guarded border. >> reporter: johnson denied reports biden pressured him to keep the agreement in place. >> there is complete harmony on the need to keep going, find solutions and make sure we uphold the belfast good friday agreement. >> reporter: biden will meet with several world leaders while abroad including a high stakes showdown with russian president vladimir putin and first lady jill biden says he's been studying for weeks. >> i think he's so well-prepared. i mean, he's -- you know, he's been studying for weeks, you