International laws can significantly affect domestic practices by establishing standards that nations feel compelled to adhere to due to treaties or conventions. These laws can influence a range of issues, including human rights, trade, and environmental regulations. When countries ratify international agreements, they may have to adjust their local laws to comply with these commitments, thereby impacting their sovereignty and legislative autonomy. Compliance with international norms can help foster global cooperation but may also lead to conflicts when they contradict national interests.