The Louth TD was addressing the party's conference in Dublin which brought together all the successful local government and European election candidates for the first time since the elections in May.In order for success in the upcoming talks on the three contentious issues, Mr Adams said there needed to be more engagement from the US, UK and Irish governments.He said: "The Irish and British governments must become more engaged in upholding and fulfilling their obligations."We also need the continuing support of the US Administration, of political leaders on Capitol Hill and of Irish America."Mr Adams also said he did not believe there was an "appetite for the challenge of dealing with the outstanding issues in any serious way" from unionists.He added: "Sinn Féin demonstrated very clearly during the Haass negotiations our seriousness and determination to find a way forward."We made compromises during those talks."For any process aimed at resolving these issues to succeed unionist political leaders need to show a similar willingness. That has not been evident so far."Despite this, there does exist a window of opportunity to resolve the issues of flags, parades and the past."Sinn Féin will meet separately with Taoiseach Enda Kenny and British Prime Minister David Cameron in the next few weeks."Party leaders in the Executive have agreed an intensive round of talks and Sinn Féin is engaging positively in this process."Following the failure of the Haass talks to reach agreement on the issues late last year, the five Executive parties are set to meet next week in order to address the matters in the first of two sessions to be held.