this type of expansion is not characteristic of a country that is losing.

ukraine has never seen durable strategic advantage in bombing civilians (unlike putin).
and at many points in the war, they simply did not even have enough capacity for a long list of strategic targets.
zelenskyy is the opposite of kegseth, who thinks 'victory' is depleting nearly all your multi-millions dolls missiles to take out thousand dollar drones.

- iran
targeting russia's main drone supplier is working, as russia's internal mfg directly from china suppliers is not mature.
china is also a bit careful in not getting caught providing mostly assembled products converted to armaments.
i have no idea if\why ukraine would target non-drone , or non-critical, supplies from iran to russia.

- adjacent oil\refinery
cutting off this money funding russia's war economy has been one of ukraine's most successful tactics.
even if interested, trump was always too inept to structure and enforce effective multi-national sanctions.
expect ukraine to target russia-owned and\or russia importing fossil infrastructure that is just outside russia borders, but in a semi-puppet nation.