The US president’s National Security Advisor John Bolton called Kosovo and Serbia to reach an agreement to resolve their disputes, the Kosovo state TV RTK reported on Wednesday.

“The time is now for Kosovo and Serbia to reach an Agreement. The US stands ready to help both parties achieve this historic goal,” Bolton wrote on is Twitter account following a meeting with Kosovo President Hashim Thaci in Washington.

Met with President Hashim Thaci of Kosovo today at the White House. We agreed the time is now for Kosovo and Serbia to reach an agreement. The U.S. stands ready to help both parties achieve this historic goal.

— John Bolton (@AmbJohnBolton) November 27, 2018

Thaci met on Tuesday with Secretary of State Mike Pompeo who called Pristina to revoke its decision to raise tariffs on goods from Serbia.