But some analysts were sceptical that the Kabul Process meetings would lead to peace talks.
"We were not the only targets, the entire diplomatic community was the target of this attack", Ghani told foreign diplomats gathered an worldwide peace conference in Kabul. This is the last chance, take it or face consequences.
Kabul has been on edge since the bombing in the highly fortified area last Wednesday, the deadliest in the city since 2001.
"The launch of the Kabul Process tomorrow is an important marker for each and every country in the region to show its true support for Afghanistan's aspirations for peace", said Dominic Jermey, the British ambassador to Kabul.
As for the Islamic State threat, Ghani put the number of foreign fighters flowing to Afghanistan to join the Islamist militant group at 11,000, far higher than the 1,200 to 1,500 previously estimated by the country's intelligence services.
Most of the casualties were civilians and many of those killed were women and children, authorities said at the time.
A series of blasts in the country's capital last Saturday killed at least 19 people at a funeral for one of the victims of clashes between police and protesters a day before.
"Even if Russian Federation and others want to hold peace meetings, their agendas would have to be in accordance with the Kabul Process". This has been one of the bloodiest weeks in Kabul with more than 80 dead and 450 injured in four days.
He called for peace talks with the group.
Afghan President Ashraf Ghani said neighboring Pakistan has instigated an "undeclared war of aggression" against his nation after repeated bombings in Kabul in the past week, including the deadliest attack on the capital in 16 years. The two-member Pakistani delegation is headed by Additional Secretary UN and Economic Cooperation Tasneem Aslam.
A special conference of the Corps Commanders was held at the General Headquarters of the Pakistan Army on Tuesday during which the forum expressed its solidarity with the people and security forces of Afghanistan in the backdrop of recent terrorist incidents.