"The safer it is in BiH, the safer it is for Croatia," he told reporters in Sarajevo after meeting with BiH Security Minister Dragan Mektic.
Ostojic said Croatia would give BiH the border surveillance system it had been given by the EU. Mektic said the equipment was worth US$ 10 million.
Ostojic said everything was being done for Croatia to enter the Schengen Area as soon as possible. He recalled that the Croatian police had been implementing the Schengen Area border regime since 1 July 2013 and that, after it formally entered the area, not much would change on its border with Croatia. He said everything would be done to ensure swift passenger traffic.
"We have a joint border of over 1,000 kilometres and when Croatia enters the Schengen Area, that will be a big challenge for Croatia, but BiH too," Mektic said, adding that BiH wanted to prove that it was capable of protecting the Schengen Area's outer borders.
Discussing the Pope's visit to Sarajevo on June 6, Ostojic said the Croatian police would check vehicles on its territory bringing pilgrims to BiH. "If there is any security threat, we will do everything to notify our colleagues."
Mektic said representatives of all major security agencies in the region were expected to meet in Sarajevo next week to discuss joint security measures during the pontiff's visit. He said the Pope's arrival was a big security challenge for the region. "Tens of thousands of faithful will come to Sarajevo" and every step is being taken to ensure a safe assembly, he added.
Security is especially important in the wake of last month's terrorist attack in east BiH, with Ostojic saying that terrorism was a global threat.
He said prevention was much more important than stricter control of the EU borders, and that one should not talk only about "hotbeds of (terrorism) in the neighbourhood" as the main problem because there were many in EU member states who could pose a threat.
The best part of what the EU has introduced is the elimination of content from the Internet and social networks that facilitate the recruitment of supporters of radical ideas, Ostojic said.
Mektic said security in the Western Balkans could be viewed on the whole and through the cooperation between its states. He said BiH would carry out "an uncompromising fight against terrorism."
Mektic said a possibility was being considered to amend the Croatia-BiH police cooperation agreement so that BiH police could help Croatian police patrol the Croatian coastal resorts with the highest number of BiH tourists.