Anti-nuclear campaigners who want Canada to push for a global ban on nuclear weapons are concerned that Foreign Affairs Minister Stéphane Dion is showing a definite lack of enthusiasm for that goal.

Dion said in a speech earlier this month that the current global security environment is simply not conducive to a ban on nuclear weapons because some states just won't relinquish them.

Cesar Jaramillo, executive director of the peace group Project Ploughshares, says there's never a perfect time to push for such a ban and the time to start is now.

Nuclear disarmament and security will be front and centre later this week as U.S. President Barack Obama hosts his final Nuclear Security Summit in Washington.

Prime Minister Justin Trudeau is to attend the two-day meeting, which is focused on curbing nuclear terrorism by cracking down on the trafficking of materials needed to build such a weapon.

Obama announced the initiative in a landmark speech in Prague in 2009, in which he expressed his aspiration for a nuclear-free world, even if it didn't come in his lifetime.

'Less than perfect'

Earlier this month, Dion said in a speech in Geneva that any negotiations to ban nuclear weapons would have to include all countries that possess them.

"Without the participation of the countries possessing nuclear weapons, a ban would not bring us any closer to our shared goal of a world free of nuclear weapons," Dion said on March 2.

Cesar Jaramillo

Cesar Jaramillo, executive director of the peace group Project Ploughshares, says he has seen little change from the previous Conservative government in the Liberals' stand on nuclear abolition. (Council of Churches)

"Indeed, premature action risks undermining international stability by creating a false sense of security, without any reliable underpinnings."

Dion's remarks largely flew under the radar but anti-nuclear activists took note.

"The reality is that there will never be ideal international security conditions for nuclear disarmament," Jaramillo said Monday.

"Nuclear abolition will be a complex, multifaceted undertaking that will need to coexist with international security crises of varying gravity," he added.

"Nuclear disarmament measures must be started, implemented and concluded in geopolitical conditions that are predictably less than perfect."

Remember landmines

Paul Meyer, a retired diplomat who once served as Canada's disarmament ambassador, said Dion should be pushing harder for a progress on broader disarmament in spite of the geopolitical obstacles. He cited Canada's leadership in championing the anti-landmine treaty in the 1990s.

"Minister Dion should recall that if Canada had only been willing to consider 'incremental' progress on the disarmament of landmines back in 1997 we would still be in a world awash with these weapons," Meyer wrote in a recent column in Ottawa's Embassy newsweekly.

This week's Washington summit on curbing the trafficking of nuclear components comes amid periodic reports of the theft of radioactive material that could be used to build a so-called "dirty bomb."

Jaramillo said preventing nuclear terrorism is a worthy and urgent objective.

"But it cannot be understood in isolation from the broader multilateral dynamics related to nuclear disarmament and the slow pace of progress toward that goal," he added.

"It is still early in the Liberal government and it may still be formulating its stand on nuclear abolition. So far, however, there has been little change from the Conservative government concerning Canada's core positions in this regard."