Let's say that the current President of Mexico was extremely corrupt. He had been voted into office on order to integrate economically with Venezuela and Cuba, but he reneged on his promises due to American bribes and instead expanded NAFTA. When almost half of the country opposes this policy, and hundreds of thousands of Mexicans protest peacefully in the capital, he deploys snipers and militarized police to quell the protests, and institutes laws restricting free speech and association. The situation becomes so bad that even his own party abandons him and he's removed by the Mexican Congress with less than the required vote. After granting this man asylum, the US then invades Yucatan (using a BS referendum to justify it) and funds cartels and militias to destabilize Ukraine.
Would you consider the US' actions to be aggressive?