Armenia’s president headed to Brussels for talks with the European Union and NATO military alliance on Wednesday in a renewed drive to end the heaviest fighting since the 1990s over the mountain enclave Nagorno-Karabakh.

As part of a wide diplomatic push from major global powers, the Azeri and Armenian foreign ministers also flew to Moscow for talks with Russia, which has brokered two ceasefires but failed to end clashes killing hundreds of people the last month, Reuters reported. 

The warring sides’ foreign ministers then go to Washington for talks on Friday involving U.S. Secretary of State Mike Pompeo, which has raised hopes of a breakthrough.