U.S. national security adviser John Bolton met with Russian President Vladimir Putin in Moscow on Wednesday to discuss a potential meeting between President Trump and Putin. The meeting will likely take place in mid-July, and the details are expected to be announced on Thursday. While it might not seem that important when exactly these two leaders meet, the timing of the meeting matters for NATO allies.

After Trump’s last-minute Twitter announcement reversing U.S. support for the G-7 statement earlier this month and his high-profile meeting with North Korea’s Kim Jong Un, U.S. allies are weary of foreign policy surprises from the White House. The announcement of Trump’s meeting with Putin has likely spurred a new wave of speculation about what the president might agree to with the Russian leader and what the implications for NATO might be.