The 2022 defense strategy increases focus on allies as a key element of U.S. defense, underscoring the broader Biden administration effort to repair relations with partner nations.

Biden, Japanese Prime Minister Yoshihide Suga, Indian Prime Minister Narendra Modi and Australian Prime Minister Scott Morrison will all participate in the summit.

Ex-envoy Bruce Heyman says the killing of Iranian Maj.-Gen. Qassem Soleimani by a U.S. drone near Baghdad's airport last week elevates that disregard of American allies to a new level.