Only one question in four debates was asked about Canada's military presence in the country.
Canada's military has not revealed any details about any information disclosed to the Russians.
His opponents accused Mr Harper of just that when he extended Canada's military deployment in Afghanistan until 2009.
The case has become a major embarrassment for Canada as its military and government struggle to explain how the former navy officer was able to use such primitive methods to copy and convey his material and remain undetected for so long, our correspondent adds.
Following his arrival the duke was presented with the insignia of a Companion of the Order of Canada and Commander of the Order of Military Merit by the Governor General of Canada, David Johnston.
He did not dwell on recent bans on the LTTE by Britain and Canada, or the military stalemate between the rebels and the government, which sharpen the incentive to talk.
He notes that, according to the Stockholm International Peace Research Institute, South Korea's military spending in 2010 exceeded that of Australia and Canada, which are better known for their military outreach.
There are thought to be about 200 deserters from the US military living in Canada.
America would be concerned, argues Mr Nikonov, if Mexico and Canada were to join a military organisation led by Russia.
ECONOMIST: Russian worries about Western encirclement are premature
Support seems to be flagging in Canada for that country's military role in Afghanistan.
Canada reportedly is prepared to offer military forces to the campaign.
Last week, the United States came together with representatives from Canada and the United Kingdom to address military mental health.
WHITEHOUSE: An International Approach to Military Mental Health
During the Vietnam War, tens of thousands of Americans, many of them trying to avoid being drafted into the military, sought refuge in Canada.
Russia has updated a nuclear-submarine fleet, partly based in an Arctic port, and Canada has talked of beefing up a military presence in its vast polar region.
Earlier, he was awarded one of Canada's highest orders Companion of the Order of Canada and the Commander of the Order of Military Merit.
Canadian Defense Minister Art Eggleton said Sunday on CBC Newsworld that "we may have to rework how some of our forces are currently deployed, " and said there are limits on how much Canada can contribute because of the size of its military.
Mr Harper said Canada - a Nato member - was not considering direct military involvement in Mali.
The increase in military spending was designed in part to assure America that Canada is increasing its effort to fight terrorism and secure the common border.
Canada, which is supplying logistical support to the mission, sent a military transport plane to France, where it was loaded Tuesday with supplies and personnel to continue on to Mali.
In May Stephen Harper, the prime minister, unveiled a new defence strategy called Canada First, with a pledge to increase the annual budget for the military by two-thirds over 20 years.
Canada is supplying logistical support to the mission and on Tuesday sent a military transport plane to France, where it was loaded with supplies and personnel to continue on to Mali.
Military bands from countries around the world including Australia, Switzerland, Norway, Canada and the US have been performing during its three-week run, which ends on Saturday.
But Canada's Conservative government has argued the situation has changed since the Vietnam era because the US military is now an all-volunteer force.
Planes from the United States, Canada, Spain, and Denmark landed at Italian bases in the last few hours as the coalition assembles more military assets.
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