President Joe Biden is planning to hold two high-profile bilateral meetings during the NATO summit this week, finding time to sit down one-on-one with Turkey’s Recep Tayyip Erdoğan and Ukraine’s Volodymyr Zelenskyy.

The sessions, described to POLITICO by two people familiar with the planning, will come on the sidelines of the two-gathering of transatlantic allies this week.

On Tuesday, Biden will sit down with Erdoğan to convince the autocrat that he should accept Sweden as NATO’s 32nd member. Erdoğan has blocked the move for more than a year, claiming that Stockholm was too cozy with Kurds that Ankara considers to be terrorists. The last few weeks have featured a flurry of diplomatic activity to break the deadlock, and Biden will likely aim to secure a pathway forward in his face-to-face chat.

The meeting with Zelenskyy, which is planned for Wednesday but not finalized, would be equally as testy. Kyiv hopes NATO would provide Ukraine with a speedy path into the alliance, even though Biden and other member nations oppose the idea of doing that soon. One reason is that making Ukraine an ally now would essentially put NATO at war with Russia, which continues its nine-year invasion.

Biden will look to convince Zelenskyy that removing a series of bureaucratic hurdles and reforms, in addition to a large security commitment by the U.S. and some NATO allies, was the most Kyiv could get in Vilnius this year.

Ukraine has not confirmed any plans for Zelenskyy to attend the summit.

It’s unclear if either discussion will produce a breakthrough. But holding the meetings shows Biden wants to invest himself personally — and the power of the presidency — in both relationships.

The National Security Council didn’t immediately respond to a request for comment.