The European Union believes it has a duty to make its voice heard as the Palestinians’ biggest aid donor and Israel’s top trade partner.

The EU’s top diplomat pledged on Thursday to reinvigorate diplomacy with Russia, the United States, Jordan and others to ensure Palestinians have a capital in Jerusalem after U.S. President Donald Trump recognized the city as Israel’s capital.

The European Union, a member of the Middle East Quartet along with the United States, the United Nations and Russia, believes it has a duty to make its voice heard as the Palestinians’ biggest aid donor and Israel’s top trade partner.

“The European Union has a clear and united position. We believe the only realistic solution to the conflict between Israel and Palestine is based on two states and with Jerusalem as the capital of both,” EU foreign policy chief Federica Mogherini told a news conference.

She said she would meet Jordan’s foreign minister on Friday, while she and EU foreign ministers would discuss Jerusalem with Israeli Prime Minister Benjamin Netanyahu in Brussels on Monday.

“The European Union will engage even more with the parties and with our regional and international partners. We will keep working with the Middle East Quartet, possibly in an enlarged format,” said Mogherini, citing Jordan, Egypt and Saudi Arabia, as well as Norway. “We remain convinced that the role of the United States ... is crucial,” she said.