European militaries are emptying their arsenals to send heavy-duty howitzers to Ukraine

• The US and European countries have sent scores of artillery pieces to Ukraine.
• A few countries have sent most or all of their artillery arsenals to help Kyiv fight Russia.
• Those militaries now face the challenge of supplying Ukraine while keeping their own forces armed.

The US and European countries have sent scores of artillery pieces to Ukraine. A few countries have even sent most or all of their artillery arsenals. The question now is how many cannons and how many rounds can they give and still keep their own forces armed.