He'll meet today in Riga with Latvian Prime Minister Maris Kucinskis and President Raimonds Vejonis, lay flowers at the monument of freedom and take part in a number of activities on the military base in Adazi.
The message is hardly subtle, and has one overarching aim: to counteract Trump's ongoing efforts to portray Canada and other member states as pinching pennies when it comes to the military spending target of two per cent of GDP - a benchmark agreed to by allies at the 2014 summit in Wales.
"I think it's an important metric, amongst many others, to gauge how countries are doing in terms of contributors to NATO", Trudeau said.
Canada assumes command of the mission, which will be led by an as yet unnamed Canadian major-general, for one year.
Without those costs, Canada's reported defence spending would have been around one per cent of GDP.
"We have to build that democracy and strengthen it", Trudeau said at a German Marshall Fund event on the sidelines of the two-day summit.
Canada does have a plan to increase its defence spending over the next 10 years, he stressed - a plan that his government's own projections show will only reach 1.4 per cent of GDP by 2024.
"This need not presage a darker time, like Rome's withdrawal from Britain, but more will be required of the world's other free countries. Are we contributing the kinds of resources and demonstrating the kind of commitment to the alliance that always needs to be there?'"
Over two days, the leaders are also expected to announce that they will continue to help fund the Afghan army.
Trudeau's photo ops with Canadian troops overseas will be aimed at buttressing Canada's argument that it provides meaningful and substantial contributions to the alliance, even if it isn't meeting the two per cent target.
NATO Secretary General Jens Stoltenberg applauded Canada and European allies Tuesday for having reversed years of cuts by investing more in defence and contributing more troops and equipment to collective security - even as he pushed back against suggestions the alliance was in trouble.
"In order to trade we have to have safety", he said.
The United States and Canada to significantly increase its military presence in Europe.
His appearance at North Atlantic Treaty Organisation comes just ahead of another summit between himself and Russian President Vladimir Putin, a meeting many have questioned in light of rising aggression coming from Russia in the Baltic region.
"Our first - and really our only consideration - was what served the Canadian national interest, what served Canadians, what was appropriate to do for Canada given our role in the world and the very great interest we, as Canadians, have in a functioning, rules-based global order", Freeland said.
The prime minister is expected to use the extension to defend Canada from criticism from Trump that America's northern neighbour is not spending enough on defence.