Heat oil in a pot over medium. Add onion and sauté for 4 min or until softened. Add garlic and chili flakes and sauté 1 min longer.
Add tomatoes and sugar, bring to a boil, and simmer for 10 min or until flavours have come together. Add tuna and artichokes and simmer gently for 5 min longer. Season with salt and pepper.
Cook pasta according to package directions. Drain, reserving a little water.
Toss pasta with sauce, adding reserved water as needed. Sprinkle with parsley.
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