SEOUL, South Korea — Recent inspections and seizures of banned cargo have shown that North Korea is using increasingly deceptive techniques to circumvent international sanctions, a panel of experts said in a report to the United Nations Security Council published Tuesday.

After a series of nuclear and long-range ballistic missile tests by North Korea over the past decade, the Security Council has adopted resolutions calling for increasingly vigorous sanctions aimed at crippling the North’s financial and technical capability to build weapons of mass destruction.

In its latest annual report, posted Tuesday on the United Nations website, the panel of eight experts said that North Korea has persisted in defying those resolutions not only by continuing its nuclear and ballistic missile programs but also by engaging in illegal arms trade.

“It is experienced in actions it takes to evade sanctions,” the panel said. “It makes increasing use of multiple and tiered circumvention techniques.”