If you missed it, watch Poroshenko's entire speech to a joint session of the U.S. Congress here:
This from RFE/RL's correspondent Luke Johnson in Washington:
The White House announced a new $53 million aid package for Ukraine on September 18.
The package includes $46 million in security assistance for Ukraine's military and border guards, with $7 million directed toward international relief organizations for humanitarian aid in Ukraine.
The military aid includes body armor, helmets, vehicles, night- and thermal-vision devices, and countermortar radars.
The United States has thus far provided about $60 million in nonlethal military aid to Ukraine.
Some members of Congress from both parties have called for Washington to provide lethal aid and a total of up to $350 million in military aid.
Ukrainian President Petro Poroshenko asked the U.S. congress for both lethal and nonlethal aid in an address to a joint session of Congress on September 18.
He is due to meet with President Barack Obama later in the day.
Ukrainian President Petro Poroshenko spoke to a joint session of the U.S. Congress on September 18, calling on the United States "not to let Ukraine stand alone in the face of this [Russian] aggression." Poroshenko called for further political support and military aid from the United States.
Minsk announces new round of Ukraine talks:
The Belarusian Foreign Ministry says a new round of talks aimed at finding a lasting solution to the Ukraine crisis will take place in Minsk on September 19.
A Foreign Ministry spokesman confirmed the meeting will take place but gave no time for the gathering of the so-called Contact Group that includes representatives of Russia, Ukraine, pro-Russian separatists, and the Organization for Security and Cooperation in Europe.
Andrei Purgin, the self-styled deputy prime minister of the self-proclaimed Donetsk People's Republic, will reportedly take part in the talks.
Ukraine will be represented by ex-President Leonid Kuchma.
The new talks come after Ukraine and separatists agreed to a cease-fire on September 5 as part of a "road map" to resolving five months of deadly conflict.
The fragile truce has largely held despite sporadic fighting.