By Alexander Schummer

TORONTO (Reuters) -Canada ratcheted up pressure on Russia on Tuesday for its invasion of Ukraine by shutting ports to Russian-owned ships and saying that holdings of all Russian oligarchs and companies in the country are under review.

Canada has announced a slew of measures to isolate Russia, including imposing sanctions on Russian President Vladimir Putin, closing Canadian airspace to Russian planes, banning oil imports and forbidding Canadian financial institutions from dealing with the Russian central bank, acting in tandem with other Western countries.

Ottawa expanded its import ban to include refined petroleum products and “other petroleum products from Russia,” the country’s natural resources minister tweeted on Tuesday night.

Earlier, Transport Minister Omar Alghabra said that while the number of Russian ships entering Canadian waters and ports is “small,” there will still be an impact, especially with other countries doing the same.

Russia represents less than 2% of Port of Montreal’s annual containerized volumes, and the ban will have little commercial impact, a port spokesperson said.

Port of Vancouver, Canada’s busiest, said the number of Russian-flagged vessels calling there is minimal. In the past, those have traded in crude oil, canola oil and concentrates, a spokesperson said.

Canada is tracking three Russian-flagged vessels off the East Coast, one of which is a cargo vessel, a government official told Reuters.

Canada is also scrutinizing holdings of all Russian oligarchs and Russian companies in the country, Finance Minister Chrystia Freeland told reporters on Tuesday. “We are reviewing them and everything is on the table,” she added.

Canada is sending 1,600 bulletproof vests and almost 400,000 meal rations to Ukraine.

Canada imported C$2.14 billion ($1.68 billion) worth of goods from Russia in 2021, Statistics Canada data showed, with metals and minerals among the most valuable categories. It imported C$289 million worth of Russian energy products last year, according to the agency.

($1 = 1.2738 Canadian dollars)