The EU seeks to join emerging peace negotiations for Ukraine but remains stuck on the sidelines.     Within the bloc, pressure is growing over the use of frozen Russian assets to finance Kyiv — with Belgium holding the line.     The United States' push to ram through a plan for peace in Ukraine has amped up calls for the European Union to take a decision soon on using Russian frozen assets to fund Kyiv while also finding its way to the negotiating table.     Washington's 28-point proposal to