As Russian Troop Deaths Climb, Morale Becomes an Issue, Officials Say

In 36 days of fighting on Iwo Jima during World War II, nearly 7,000 Marines were killed. Now, 20 days after President Vladimir V. Putin of Russia invaded Ukraine, his military has already lost more soldiers, according to American intelligence estimates.

The conservative side of the estimate, at more than 7,000 Russian troop deaths, is greater than the number of American troops killed over 20 years in Iraq and Afghanistan combined.

It is a staggering number amassed in just three weeks of fighting, American officials say, with implications for the...