Boko Haram, which has existed in various forms since the 1990s, was for many years the country's biggest security challenge. The insurgency, which started in Borno State, was concentrated in the northeast region. But now, other non-state armed groups are spreading violence all over Nigeria.
At least 7,222 Nigerians were killed and 3,823 abducted as a result of 2,840 violent incidents between January and July 2022.
Buhari made a number of promises to address Nigeria's chronic security problems. But he failed to effectively address them.
As a sociologist with specialisation in civil-military relations, armed groups, criminology and security studies, peace and conflict management and human rights, I have been researching various aspects of insecurity in Nigeria. Based on this work, I outline urgent steps the Tinubu administration must take to turn the tide of insecurity.
It needs to audit the security budget allocation of its predecessor and take a close look at its implementation. This will help identify areas of inefficiency and corruption.
There is also a need for enhanced oversight and coordination among security agencies.
On top of this, the Tinubu administration needs to address underlying socio-economic factors that contribute to insecurity. Investment in education, healthcare and infrastructure development is crucial. So are job creation, poverty alleviation and inclusive economic growth.
Buhari's administration got off to a strong start in 2015 because it was able to secure arms from the US. This made an impact on the capacity of terror and insurgent groups in the northeast.
But, over his two terms, things got worse in every part of the country.
North-east Nigeria: ISWAP (Islamic State West Africa Province), in particular, remained resilient by continuously altering its operational strategies - using unmanned aerial vehicles, for example.
The group has attacked military and civilian targets in northwest Nigeria and remains a threat in the northeast.
Dislocate locals
The middle belt: This comprises states in the north-central and parts of north-west and north-east Nigeria. In Plateau State, Benue State and southern Kaduna, rural communities face attacks from ethnic militias identified by survivors as Fulani.
Most of the attacks are executed to dislocate locals. They destroy crops and farmlands, kill people and animals, burn houses, and make survivors afraid to return.
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In 2018, these attacks claimed six times more civilian fatalities than the terrorist insurgency in the northeast.
Over 100 settlements in Plateau State and southern Kaduna have been occupied by Fulani groups and renamed after communities were displaced.
The issue has been raised in the National Assembly. And in 2020, the Plateau State government enacted a law against kidnapping, land grabbing, cultism and other violence.
But attacks continued in Plateau State communities.
North-west region: A new wave of banditry emerged in the region during Buhari's administration. Initially, it appeared to be driven by ethnic feuds between Fulani and Hausa groups. But militia groups who had taken refuge in forests also appeared to be involved.
The security budget and its implementation must be audited to identify inefficiencies and corruption. Regular audits, citizen participation and whistle-blower protection would improve transparency and accountability.
Security agencies need better oversight and coordination, along with performance monitoring and accountability. These measures can improve the impact of security budgets.
It's also vital to address the socio-economic factors that contribute to insecurity. The country needs job creation, poverty alleviation and inclusive economic growth, particularly in areas affected by insurgency and insecurity.
Investment in education, healthcare and infrastructure will create opportunities that discourage criminal activities.
Inclusive governance is essential for peaceful coexistence and a sense of belonging.
Written by Sallek Yaks Musa, The Conversation